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Friday, June 19, 2020

George Washington and slavery

From Wikipedia, the free encyclopedia
 
painting
George Washington (John Trumbull, 1780), with William Lee, Washington's enslaved personal servant
 
George Washington was a Founding Father of the United States who owned slaves and became uneasy with the institution of slavery, but only provided for the emancipation of his slaves after his death. Slavery was ingrained in the economic and social fabric of colonial Virginia, and Washington inherited his first ten slaves at the age of eleven on the death of his father in 1743. In adulthood his personal slaveholding grew through inheritance, purchase and natural increase. In 1759, he gained control of dower slaves belonging to the Custis estate on his marriage to Martha Dandridge Custis. Washington's early attitudes to slavery reflected the prevailing Virginia planter views of the day and he demonstrated no moral qualms about the institution. He became skeptical about the economic efficacy of slavery before the American Revolutionary War. Although he expressed support in private for the abolition of slavery by a gradual legislative process after the war, Washington remained dependent on slave labor. By the time of his death in 1799 there were 317 slaves at his Mount Vernon estate, 124 owned by Washington and the remainder managed by him as his own property but belonging to other people.

Washington was a demanding master. He provided his slaves with basic food, clothing and accommodation comparable to general practice at the time but not always adequate, and with medical care. In return, he expected them to work diligently from sunrise to sunset over the six-day working week that was standard at the time. Some three-quarters of his slaves labored in the fields, while the remainder worked at the main residence as domestic servants and artisans. They supplemented their diet by hunting, trapping, and growing vegetables in their free time, and bought extra rations, clothing and housewares with income from the sale of game and produce. They built their own community around marriage and family, though because Washington allocated slaves to farms according to the demands of the business without regard for their relationships, many husbands lived separately from their wives and children. Washington used both reward and punishment to encourage and discipline his slaves, but was constantly disappointed when they failed to meet his exacting standards. They resisted enslavement by various means, including theft to supplement food and clothing and as another source of income, by feigning illness, and by running away.

Washington's first doubts about slavery were entirely economic, prompted by his transition from tobacco to grain crops in the 1760s which left him with a costly surplus of slaves. As commander-in-chief of the Continental Army in 1775, he initially refused to accept African-Americans, free or slave, into the ranks, but reversed this position due to the demands of war. The first indication of moral doubt appeared during efforts to sell some of his slaves in 1778, when Washington expressed distaste for selling them at a public venue and his desire that slave families not be split up as a result of the sale. His public words and deeds at the end of the American Revolutionary War in 1783 showed no antislavery sentiments. Politically, Washington was concerned that such a divisive issue as slavery should not threaten national unity, and he never spoke publicly about the institution. Privately, Washington considered freeing all the slaves he controlled in the mid-1790s, but could not realize this because of his economic dependence on them and the refusal of his family to cooperate. His will provided for the emancipation of his slaves, the only slave-owning Founding Father to do so. Because many of his slaves were married to Martha's dower slaves, whom he could not legally free, Washington stipulated that, with the exception of his valet William Lee who was freed immediately, his slaves be emancipated on the death of Martha. She freed them in 1801, a year before her own death, but her dower slaves were passed to her grandchildren and remained in bondage.

Background

Black and white illustration
First slaves arriving in Virginia

Slavery was introduced into the English colony of Virginia when the first Africans were transported to Point Comfort in 1619. Those who accepted Christianity became "Christian servants" with time-limited servitude, or even freed, but this mechanism for ending bondage was gradually shut down. In 1667, the Virginia Assembly passed a law that barred baptism as a means of conferring freedom. Africans who had been baptised before arriving in Virginia could be granted the status of indentured servant until 1682, when another law declared them to be slaves. Whites and people of African descent in the lowest stratum of Virginian society shared common disadvantages and a common lifestyle, which included intermarriage until the Assembly made such unions punishable by banishment in 1691.

In 1671, Virginia counted 6,000 white indentured servants among its 40,000 population but only 2,000 people of African descent, up to a third of whom in some counties were free. Towards the end of the 17th century, English policy shifted in favor of retaining cheap labor rather than shipping it to the colonies, and the supply of indentured servants in Virginia began to dry up; by 1715, annual immigration was in the hundreds, compared with 1,500–2,000 in the 1680s. As tobacco planters put more land under cultivation, they made up the shortfall in labor with increasing numbers of slaves. The institution was rooted in race with the Virginia Slave Codes of 1705, and from around 1710 the growth in the slave population was fueled by natural increase. Between 1700 and 1750 the number of slaves in the colony increased from 13,000 to 105,000, nearly eighty percent of them born in Virginia. In Washington's lifetime, slavery was deeply ingrained in the economic and social fabric of Virginia, where some forty percent of the population and virtually all African Americans were enslaved.

George Washington was born in 1732, the first child of his father Augustine's second marriage. Augustine was a tobacco planter with some 10,000 acres (4,000 ha) of land and 50 slaves. On his death in 1743, he left his 2,500-acre (1,000 ha) Little Hunting Creek to George's older half-brother Lawrence, who renamed it Mount Vernon. Washington inherited the 260-acre (110 ha) Ferry Farm and ten slaves. He leased Mount Vernon from Lawrence's widow two years after his brother's death in 1752 and inherited it in 1761. He was an aggressive land speculator, and by 1774 he had amassed some 32,000 acres (13,000 ha) of land in the Ohio Country on Virginia's western frontier. At his death he possessed over 80,000 acres (32,000 ha). In 1757, he began a program of expansion at Mount Vernon that would ultimately result in an 8,000-acre (3,200 ha) estate with five separate farms, on which he initially grew tobacco.

Black and white map showing farms at Mount Vernon
Mount Vernon estate

Agricultural land required labor to be productive, and in the 18th-century American south that meant slave labor. Washington inherited slaves from Lawrence, acquired more as part of the terms of leasing Mount Vernon, and inherited slaves again on the death of Lawrence's widow in 1761. On his marriage in 1759 to Martha Dandridge Custis, Washington gained control of eighty-four dower slaves. They belonged to the Custis estate and were held in trust by Martha for the Custis heirs, and although Washington had no legal title to them, he managed them as his own property. Between 1752 and 1773, he purchased at least seventy-one slaves – men, women and children. He scaled back significantly his purchasing of slaves after the American Revolution but continued to acquire them, mostly through natural increase and occasionally in settlement of debts. In 1786, he listed 216 slaves – 122 men and women and 88 children. – making him one of the largest slaveholders in Fairfax County. Of that total, 103 belonged to Washington, the remainder being dower slaves. By the time of Washington's death in 1799, the slave population at Mount Vernon had increased to 317 people, including 143 children. Of that total, he owned 124, leased 40 and controlled 153 dower slaves.

Slavery at Mount Vernon

Washington thought of his workers as part of an extended family with him the father figure at its head. He displayed elements of both patriarchy and paternalism in his attitudes to the slaves he controlled. The patriarch in him expected absolute obedience and manifested itself in a strict, rigorous control of the slaves and the emotional distance he maintained from them. There are examples of genuine affection between master and slave, such as was the case with his valet William Lee, but such cases were the exception. The paternalist in him saw his relationship with his slaves as one of mutual obligations; he provided for them and they in return served him, a relationship in which slaves were able to approach Washington with their concerns and grievances. Paternal masters regarded themselves as generous and deserving of gratitude. When Martha's maid Oney Judge escaped in 1796, Washington complained about "the ingratitude of the girl, who was brought up and treated more like a child than a Servant."

George Washington is a hard master, very severe, a hard husband, a hard father, a hard governor. From his childhood he always ruled and ruled severely. He was first brought up to govern slaves, he then governed an army, then a nation. He thinks hard of all, is despotic in every respect, he mistrusts every man, thinks every man a rogue and nothing but severity will do.
Thomas Jefferson, 1799

Although Washington employed a farm manager to run the estate and an overseer at each of the farms, he was a hands-on manager who ran his business with a military discipline and involved himself in the minutiae of everyday work. During extended absences while on official business, he maintained close control through weekly reports from the farm manager and overseers. He demanded from all of his workers the same meticulous eye for detail that he exercised himself; a former slave would later recall that the "slaves...did not quite like" Washington, primarily because "he was so exact and so strict...if a rail, a clapboard, or a stone was permitted to remain out of its place, he complained; sometimes in language of severity." In Washington's view, "lost labour is never to be regained," and he required "every labourer (male or female) [do] as much in the 24 hours as their strength without endangering the health, or constitution will allow of." He had a strong work ethic and expected the same from his workers, slave and hired. He was constantly disappointed with slaves who did not share his motivation and resisted his demands, leading him to regard them as indolent and insist that his overseers supervise them closely at all times.

In 1799, nearly three-quarters of the slaves, over half of them female, worked in the fields. They were kept busy year round, their tasks varying with the season. The remainder worked as domestic servants in the main residence or as artisans, such as carpenters, joiners, coopers, spinners and seamstresses. Between 1766 and 1799, seven dower slaves worked at one time or another as overseers. Slaves were expected to work from sunrise to sunset over a six-day work week that was standard on Virginia plantations. With two hours off for meals, their workdays would range between seven and a half hours to thirteen hours, depending on season. They were given three or four days off at Christmas and a day each at Easter and Whitsunday. Domestic slaves started early, worked into the evenings and did not necessarily have Sundays and holidays free. On special occasions when slaves were required to put in extra effort, such as working through a holiday or bringing in the harvest, they were paid or compensated with extra time off.

Washington instructed his overseers to treat slaves "with humanity and tenderness" when sick. Slaves who were less able, through injury, disability or age, were given light duties, while those too sick to work were generally, though not always, excused work while they recovered. Washington provided them with good, sometimes costly medical care – when a slave named Cupid fell ill with pleurisy, Washington had him taken to the main house where he could be better cared for and personally checked on him throughout the day. The paternal concern for the welfare of his slaves was mixed with an economic consideration for the lost productivity arising from sickness and death among the labor force.

Living conditions

Photograph
Modern reconstruction of a slave cabin at Mount Vernon

At Mansion House Farm, most slaves were housed in a two-story frame building known as the "Quarters for Families". This was replaced in 1792 by brick-built accommodation wings either side of the greenhouse comprising four rooms in total, each some 600 square feet (56 m2). The Mount Vernon Ladies' Association have concluded these rooms were communal areas furnished with bunks that allowed little privacy for the predominantly male occupants. Other slaves at Mansion House Farm lived over the outbuildings where they worked or in log cabins. Such cabins were the standard slave accommodation at the outlying farms, comparable to the accommodation occupied by the lower strata of free white society across the Chesapeake area and by slaves on other Virginia plantations. They provided a single room that ranged in size from 168 square feet (15.6 m2) to 246 square feet (22.9 m2) to house a family. The cabins were often poorly constructed, daubed with mud for draft- and water-proofing, with dirt floors. Some cabins were built as duplexes; some single-unit cabins were small enough to be moved on carts. There are few sources which shed light on living conditions in these cabins, but one visitor in 1798 wrote, "husband and wife sleep on a mean pallet, the children on the ground; a very bad fireplace, some utensils for cooking, but in the middle of this poverty some cups and a teapot." Other sources suggest the interiors were smoky, dirty and dark, with only a shuttered opening for a window and the fireplace for illumination at night.

Washington provided slaves with a blanket each fall at most, which they used for their own bedding and which they were required to use to gather leaves for livestock bedding. Slaves at the outlying farms were issued with a basic set of clothing each year, comparable to the clothing issued on other Virginia plantations. Slaves slept and worked in their clothes, leaving them to spend many months in garments that were worn, ripped and tattered. Domestic slaves at the main residence who came into regular contact with visitors were better clothed; butlers, waiters and body servants were dressed in a livery based on the three-piece suit of an 18th-century gentleman, and maids were provided with finer quality clothing than their counterparts in the fields.

Washington desired his slaves to be fed adequately but no more. Each slave was provided with a basic daily food ration of one US quart (0.95 l) or more of cornmeal, up to eight ounces (230 g) of herring and occasionally some meat, a fairly typical ration for slaves in Virginia that was adequate in terms of the calorie requirement for a young man engaged in moderately heavy agricultural labor but nutritionally deficient. The basic ration was supplemented by slaves' own efforts hunting (for which some slaves were allowed guns) and trapping game. They grew their own vegetables in small garden plots they were permitted to maintain in their own time, on which they also reared poultry.

Washington often tipped slaves on his visits to other estates, and it is likely that his own slaves were similarly rewarded by visitors to Mount Vernon. Slaves occasionally earned money through their normal work or for particular services rendered – for example, Washington rewarded three of his own slaves with cash for good service in 1775, a slave received a fee for the care of a mare that was being bred in 1798 and the chef Hercules profited well by selling slops from the presidential kitchen. Slaves also earned money from their own endeavors, by selling to Washington or at the market in Alexandria food they had caught or grown and small items they had made. They used the proceeds to purchase from Washington or the shops in Alexandria better clothing, housewares and extra provisions such as flour, pork, whiskey, tea, coffee and sugar.

Family and community

Photograph showing single bedding on a pallet on a dirt floor
Interior of the reconstructed slave cabin at Mount Vernon

Although the law did not recognize slave marriages, Washington did, and by 1799 some two-thirds of the adult slaves at Mount Vernon were married. To minimize time lost in getting to the workplace and thus increase productivity, slaves were accommodated at the farm on which they worked. Because of the unequal distribution of males and females across the five farms, slaves often found partners on different farms, and in their day to day lives husbands were routinely separated from their wives and children. Only thirty-six of the ninety-six married slaves at Mount Vernon in 1799 lived together, while thirty-eight had spouses who lived on separate farms and twenty-two had spouses who lived on other plantations. The evidence suggests couples that were separated did not regularly visit during the week, and doing so prompted complaints from Washington that slaves were too exhausted to work after such "night walking", leaving Saturday nights/Sundays and holidays as the main time such families could spend together. Despite the stress and anxiety caused by this indifference to family stability – on one occasion an overseer wrote that the separation of families "seems like death to them" – marriage was the foundation on which slaves established their own community, and longevity in these unions was not uncommon.

Large families that covered multiple generations, along with their attendant marriages, were part of a slave community-building process that transcended ownership. Washington's head carpenter Isaac, for example, lived with his wife Kitty, a dower-slave milkmaid, at Mansion House Farm. The couple had nine daughters ranging in age from six to twenty-seven in 1799, and the marriages of four of those daughters had extended the family to other farms within and outside the Mount Vernon estate and produced three grandchildren. Children were born into slavery, their ownership determined by the ownership of their mothers. The value attached to the birth of a slave child, if it was noted at all, is indicated in the weekly report of one overseer, which stated, "Increase 9 Lambs & 1 male child of Lynnas." New mothers received a new blanket and three to five weeks of light duties to recover. An infant remained with its mother at her place of work. Older children, the majority of whom lived in single-parent households in which the mother worked from dawn to dusk, performed small family chores but were otherwise left to play largely unsupervised until they reached an age when they could begin to be put to work for Washington, usually somewhere between eleven and fourteen years old. In 1799, nearly sixty percent of the slave population was under nineteen years old and nearly thirty-five percent under nine.

There is evidence that slaves passed on their African cultural values through telling stories, among them the tales of Br'er Rabbit which, with their origins in Africa and stories of a powerless individual triumphing through wit and intelligence over powerful authority, would have resonated with the slaves. African-born slaves brought with them some of the religious rituals of their ancestral home, and there is an undocumented tradition of voodoo being practiced at one of the Mount Vernon farms. Although the slave condition made it impossible to adhere to the Five Pillars of Islam, some slave names betray a Muslim cultural origin. Anglicans reached out to American-born slaves in Virginia, and some of the Mount Vernon slaves are known to have been christened before Washington acquired the estate. There is evidence in the historical record from 1797 that Mount Vernon slaves had contacts with Baptists, Methodists and Quakers. The three religions advocated abolition, raising hopes of freedom among the slaves, and the congregation of the Alexandria Baptist Church, founded in 1803, included slaves formerly owned by Washington.

Mulattoes

In 1799 there were some twenty mulatto (mixed race) slaves at Mount Vernon. The probability of paternal relationships between slaves and hired white workers is indicated by some surnames: Betty and Tom Davis, probably the children of Thomas Davis, a white weaver at Mount Vernon in the 1760s; George Young, likely the son of a man of the same name who was a clerk at Mount Vernon in 1774; and Judge and her sister Delphy, the daughters of Andrew Judge, an indentured tailor at Mount Vernon in the 1770s and 1780s. There is evidence to suggest that white overseers – working in close proximity to slaves under the same demanding master and physically and socially isolated from their own peer group, a situation that drove some to drink – indulged in sexual relations with the slaves they supervised. Some white visitors to Mount Vernon seemed to have expected slave women to provide sexual favors. The living arrangements left some slave females alone and vulnerable, and the Mount Vernon research historian Mary V. Thompson writes that relationships "could have been the result of mutual attraction and affection, very real demonstrations of power and control, or even exercises in the manipulation of an authority figure."

Resistance

Newspaper clipping
Advertisement placed in the Pennsylvania Gazette after Oney Judge absconded from the President's House in 1796

The frequent comments Washington made about "rogueries" and "old tricks" indicate the resistance displayed by the slaves against the system. The most common act of resistance was theft, so common that Washington made allowances for it as part of normal wastage. Food was stolen both to supplement rations and to sell, and Washington believed the selling of tools was another source of income for slaves. Because cloth and clothing were commonly stolen, Washington required seamstresses to show the results of their work and the leftover scraps before issuing them with more material. Sheep were washed before shearing to prevent the theft of wool, and storage areas were kept locked and keys left with trusted individuals. In 1792, Washington ordered the culling of slaves' dogs he believed were being used in a spate of livestock theft and ruled that slaves who kept dogs without authorization were to be "severely punished" and their dogs hanged.

Another means by which slaves resisted, one that was virtually impossible to prove, was feigning illness. Over the years Washington became increasingly skeptical about absenteeism due to sickness among his slaves and concerned about the diligence or ability of his overseers in recognizing genuine cases. Between 1792 and 1794, while Washington was away from Mount Vernon as President, the number of days lost to sickness increased tenfold compared to 1786, when he was resident at Mount Vernon and able to control the situation personally. In one case, Washington suspected a slave of frequently avoiding work over a period of decades through acts of deliberate self harm.

Slaves asserted some independence and frustrated Washington by the pace and quality of their work. In 1760, Washington noted that four of his carpenters quadrupled their output of timber under his personal supervision. Thirty-five years later, he described his carpenters as an "idle...set of rascals" who would take a month or more to complete at Mount Vernon work that was being done in two or three days in Philadelphia. The output of seamstresses dropped off when Martha was away, and spinners found they could slacken by playing the overseers off against her. Tools were regularly lost or damaged, thus stopping work, and Washington despaired of employing innovations that might improve efficiency because he believed the slaves were too clumsy to operate the new machinery involved.

The most emphatic act of resistance was to run away, and between 1760 and 1799 at least forty-seven slaves under Washington's control did so. Seventeen of these, fourteen men and three women, escaped to a British warship that anchored in the Potomac River near Mount Vernon in 1781. In general, the best chance of success lay with second- or third-generation African-American slaves who had good English, possessed skills that would allow them to support themselves as free people and were in close enough contact with their masters to receive special privileges. Thus it was that Judge, an especially talented seamstress, and Hercules escaped in 1796 and 1797 respectively and eluded recapture. Washington took seriously the recapture of fugitives, and in three cases an escaped slave was sold off in the West Indies after recapture, effectively a death sentence in the severe conditions slaves had to endure there.

Control

Slavery was a system in which enslaved people lived in fear; fear of being sold, fear of being separated from their families or their children or their parents, fear of not being in control of their bodies or their lives, fear of never knowing freedom. No matter what their clothing was like, no matter what food they ate, no matter what their quarters looked like, enslaved people lived with that fear. And that was the psychological violence of slavery. That's how slave owners maintained control over enslaved people.
Jessie MacLeod
Associate Curator
George Washington's Mount Vernon

 
Washington used both reward and punishment to encourage discipline and productivity in his slaves. In one case, he suggested "admonition and advice" would be more effective than "further correction", and he occasionally appealed to a slave's sense of pride to encourage better performance. Rewards in the form of better blankets and clothing fabric were given to the "most deserving", and there are examples of cash payments being awarded for good behavior. He opposed the use of the lash in principle, but saw the practice as a necessary evil and sanctioned its occasional use, generally as a last resort, on both male and female slaves if they did not, in his words, "do their duty by fair means." There are accounts of carpenters being whipped in 1758 when the overseer "could see a fault", of a slave called Jemmy being whipped for stealing corn and escaping in 1773 and of a seamstress called Charlotte being whipped in 1793 by an overseer "determined to lower Spirit or skin her Back" for impudence and refusing to work.

Washington regarded the "passion" with which one of his overseers administered floggings to be counter-productive, and Charlotte's protest that she had not been whipped in fourteen years indicates the frequency with which physical punishment was used. Whippings were administered by overseers after review, a system Washington required to ensure slaves were spared capricious and extreme punishment. Washington did not himself flog slaves, but he did on occasion lash out in a flash of temper with verbal abuse and physical violence when they failed to perform as he expected. Contemporaries generally described Washington as having a calm demeanor, but there are several reports from those who knew him privately that talk of his temper. One wrote that "in private and particularly with his servants, its violence sometimes broke out." Another reported that Washington's servants "seemed to watch his eye and to anticipate his every wish; hence a look was equivalent to a command." Threats of demotion to fieldwork, corporal punishment and being shipped to the West Indies were part of the system by which he controlled his slaves.

Evolution of Washington's attitudes

Painting
Life of George Washington: The Farmer by Junius Brutus Stearns (1851)

Washington's early views on slavery were no different from any Virginia planter of the time. He demonstrated no moral qualms about the institution and referred to his slaves as "a Species of Property." The economics of slavery prompted the first doubts in Washington about the institution, marking the beginning of a slow evolution in his attitude towards it. By 1766, he had transitioned his business from the labor-intensive planting of tobacco to the less demanding farming of grain crops. His slaves were employed on a greater variety of tasks that needed more skills than tobacco planting required of them; as well as the cultivation of grains and vegetables, they were employed in cattle herding, spinning, weaving and carpentry. The transition left Washington with a surplus of slaves and revealed to him the inefficiencies of the slave labor system.

There is little evidence that Washington seriously questioned the ethics of slavery before the Revolution. In the 1760s he often participated in tavern lotteries, events in which defaulters' debts were settled by raffling off their assets to a high-spirited crowd. In 1769, Washington co-managed one such lottery in which fifty-five slaves were sold, among them six families and five females with children. The more valuable married males were raffled together with their wives and children; less valuable slaves were separated from their families into different lots. Robin and Bella, for example, were raffled together as husband and wife while their children, twelve-year-old Sukey and seven-year-old Betty, were listed in a separate lot. Only chance dictated whether the family would remain together, and with 1,840 tickets on sale the odds were not good.

The historian Henry Wiencek concludes that the repugnance Washington felt at this cruelty in which he had participated prompted his decision not to break up slave families by sale or purchase, and marks the beginning of a transformation in Washington's thinking about the morality of slavery. Wiencek writes that in 1775 Washington took more slaves than he needed rather than break up the family of a slave he had agreed to accept in payment of a debt. The historians Philip D. Morgan and Peter Henriques are skeptical of Wiencek's conclusion and believe there is no evidence of any change in Washington's moral thinking at this stage. Morgan writes that in 1772, Washington was "all business" and "might have been buying livestock" in purchasing more slaves who were to be, in Washington's words, "strait Limb'd, & in every respect strong & likely, with good Teeth & good Countenance." Morgan gives a different account of the 1775 purchase, writing that Washington resold the slave because of the slave's resistance to being separated from family and that the decision to do so was "no more than the conventional piety of large Virginia planters who usually said they did not want to break up slave families – and often did it anyway."

American Revolution

Original document
Washington's taxable property in April 1788: 121 slaves, 98 horses, 4 mules and a chariot

From the late 1760s, Washington became increasingly radicalized against the North American colonies' subservient status within the British Empire. In 1774 he was a key participant in the adoption of the Fairfax Resolves which, alongside the assertion of colonial rights, condemned the transatlantic slave trade on moral grounds. He began to express the growing rift with Great Britain in terms of slavery, stating in the summer of 1774 that the British authorities were "endeavouring by every piece of Art & despotism to fix the Shackles of Slavry [sic]" upon the colonies. Two years later, on taking command of the Continental Army at Cambridge at the start of the American Revolutionary War, he wrote in orders to his troops that "it is a noble Cause we are engaged in, it is the Cause of virtue and mankind...freedom or Slavery must be the result of our conduct." The hypocrisy inherent in slave owners characterizing a war of independence as a struggle for their own freedom from slavery was not lost on the British writer Samuel Johnson, who asked, "How is it that we hear the loudest yelps for liberty among the drivers of Negroes?"

Washington shared the common southern concern about arming African-Americans or slaves and initially refused to accept either into the ranks of the Continental Army. He reversed his position on the recruitment of free African-Americans when the royal governor of Virginia, Lord Dunmore, issued a proclamation in November 1775 offering freedom to rebel-owned slaves who enlisted in the British forces. Three years later and facing acute manpower shortages, Washington approved a Rhode Island initiative to raise a battalion of African Americans.

Washington gave a cautious response to a 1779 proposal from his young aide John Laurens for the recruitment of 3,000 South Carolinian slaves who would be rewarded with emancipation. He was concerned that such a move would prompt the British to do the same, leading to an arms race in which the Americans would be at a disadvantage, and that it would promote discontent among those who remained enslaved. During the war, some 5,000 African-Americans served in a Continental Army that was more integrated than any American force before the Vietnam War, and another 1,000 served on American warships. They represented less than three percent of all American forces mobilized, though in 1778 they provided between six and thirteen percent of the Continental Army.

The first indication of a shift in Washington's thinking on slavery appears during the war, in correspondence of 1778 and 1779 with Lund Washington, who managed Mount Vernon in Washington's absence. In the exchange of letters, a conflicted Washington expressed a desire "to get quit of Negroes", but made clear his reluctance to sell them at a public venue and his wish that "husband and wife, and Parents and children are not separated from each other." His determination not to separate families became a major complication in his deliberations on the sale, purchase and, in due course, emancipation of his own slaves. His restrictions put Lund in a difficult position with two female slaves he had already all but sold in 1778, and Lund's irritation was evident in his request to Washington for clear instructions. Despite Washington's reluctance to break up families, there is little evidence that moral considerations played any part in his thinking at this stage. He sought to liberate himself from an economically unviable system, not to liberate his slaves. They were still a property from which he expected to profit. During a period of severe wartime depreciation, the question was not whether to sell his slaves, but when, where and how best to sell them. Lund sold nine slaves, including the two females, in January 1779.

Washington's actions at the war's end reveal little in the way of antislavery inclinations. He was anxious to recover his own slaves and refused to consider compensation for the upwards of 80,000 slaves evacuated by the British, insisting without success that the British return them to their owners. Before resigning his commission in 1783, Washington took the opportunity to give his opinion on the opportunities and challenges that faced the new nation in his Circular to the States, in which he made not one mention of slavery.

Confederation years

Painting
The Marquis de Lafayette

Emancipation became a major issue in Virginia after liberalization of the manumission law in 1782. Inspired by the rhetoric that had driven the revolution, it became popular to free slaves. The free African-American population in Virginia rose from some 3,000 to more than 20,000 between 1780 and 1800, when the proslavery interest re-asserted itself. The historian Kenneth Morgan writes, "..the revolutionary war was the crucial turning-point in [Washington's] thinking about slavery. After 1783...he began to express inner tensions about the problem of slavery more frequently, though always in private..." Although Philip Morgan identifies several turning points and believes no single one was pivotal, most historians agree the Revolution was central to the evolution of Washington's attitudes on slavery. It is likely that revolutionary rhetoric about the rights of men, the close contact with young antislavery officers who served with Washington – such as Laurens, the Marquis de Lafayette and Alexander Hamilton – and the influence of northern colleagues were contributory factors in that process.

Washington was drawn into the postwar abolitionist discourse through his contacts with antislavery friends, their transatlantic network of leading abolitionists and the literature produced by the antislavery movement, though he was reluctant to volunteer his own opinion on the matter and generally did so only when the subject was first raised with him. At his death, Washington's extensive library included at least seventeen publications on slavery. Six of them had been collated into an expensively bound volume titled Tracts on Slavery, indicating that he attached some importance to that selection. Five of the six were published in or after 1788. All six shared common themes that slaves first had to be educated about the obligations of liberty before they could be emancipated, a belief Washington is reported to have expressed himself in 1798, and that abolition should be realized by a gradual legislative process, an idea that began to appear in Washington's correspondence during the Confederation period.

Washington was not impressed by what Dorothy Twohig – a former editor-in-chief of The Washington Papers – described as the "imperious demands" and "evangelical piety" of Quaker efforts to advance abolition, and in 1786 he complained about their "tamper[ing] with & seduc[ing]" slaves who "are happy & content to remain with their present masters." Only the most radical of abolitionists called for immediate emancipation. The disruption to the labor market and the care of the elderly and infirm would have created enormous problems. Large numbers of unemployed poor, of whatever color, was a cause for concern in 18th-century America, to the extent that expulsion and foreign resettlement was often part of the discourse on emancipation. A sudden end to slavery would also have caused a significant financial loss to slaveowners whose human property represented a valuable asset. Gradual emancipation was seen as a way of mitigating against such a loss and reducing opposition from those with a financial self-interest in maintaining slavery.

In 1783, Lafayette proposed a joint venture to establish an experimental settlement for freed slaves which, with Washington's example, "might render it a general practise," but Washington demurred. As Lafayette forged ahead with his plan, Washington offered encouragement but expressed concern in 1786 about "much inconvenience and mischief" an abrupt emancipation might generate, and he gave no tangible support to the idea. Washington privately expressed support for emancipation to prominent Methodists Thomas Coke and Francis Asbury in 1785, but declined to sign their petition. Although he spoke to other leading Virginians about his sentiments and promised to write in support if the petition was considered in the Virginia Assembly, nothing further came of it.

Henriques identifies Washington's concern for the judgement of posterity as a significant factor in Washington's thinking on slavery, writing, "No man had a greater desire for secular immortality, and [Washington] understood that his place in history would be tarnished by his ownership of slaves." Philip Morgan similarly identifies the importance of Washington's driving ambition for fame and public respect as a man of honor; in December 1785, the Quaker and fellow Virginian Robert Pleasants "[hit] Washington where it hurt most", Morgan writes, when he told Washington that to remain a slaveholder would forever tarnish his reputation. In correspondence the next year, Washington expressed "great repugnance" at buying slaves, stated that he would not buy any more "unless some peculiar circumstances should compel me to it" and made clear his desire to see the institution of slavery ended by a gradual legislative process.

Washington did not let principle interfere with business; he still needed labor to work his farms, and there was little alternative to slavery. Hired labor south of Pennsylvania was scarce and expensive, and the Revolution had cut off the supply of indentured servants and convict labor from Great Britain. Washington significantly reduced his slave purchases after the war, though it is not clear whether this was a moral or practical decision; he repeatedly stated that his inventory and its potential progeny were adequate for his current and foreseeable needs. Nevertheless, he negotiated with John Mercer to accept six slaves in payment of a debt in 1786 and expressed to Henry Lee a desire to purchase a bricklayer the next. In 1788, Washington acquired thirty-three slaves from the estate of Bartholomew Dandridge in settlement of a debt and left them with Dandridge's widow on her estate at Pamocra, New Kent County, Virginia. Later the same year, he declined a suggestion from the leading French abolitionist Jacques Brissot to form and become president of an abolitionist society in Virginia, stating that although he was in favor of such a society and would support it, the time was not yet right to confront the issue.

Presidential years

The unfortunate condition of the persons, whose labour in part I employed, has been the only unavoidable subject of regret. To make the Adults among them as easy & as comfortable in their circumstances as their actual state of ignorance & improvidence would admit; & to lay a foundation to prepare the rising generation for a destiny different from that in which they were born; afforded some satisfaction to my mind, & could not I hoped be displeasing to the justice of the Creator.
Statement attributed to George Washington that appears in the notebook of David Humphreys, c.1788/1789
 
Another complication for Washington's personal position on slavery was the political ramifications of emancipation. He presided over the Constitutional Convention in 1787, during which it became obvious just how explosive the issue was and how willing the antislavery faction was to accept the preservation of slavery to ensure national unity and the establishment of a strong federal government. The support of the southern states for the new constitution was secured by granting them concessions that protected slavery, including the Three-Fifths Compromise and the Fugitive Slave Clause, plus clauses that guaranteed the transatlantic slave trade for at least twenty years and federal aid for the suppression of any slave rebellion.

Washington's preeminent position ensured that any actions he took with regard to his own slaves would become a statement in a national debate about slavery that threatened to divide the country. Wiencek suggests Washington considered making precisely such a statement on taking up the presidency in 1789. A passage in the notebook of Washington's biographer David Humphreys dated to late 1788 or early 1789 recorded a statement that resembled the emancipation clause in Washington's will a decade later. Wiencek argues the passage was a draft for a public announcement Washington was considering in which he would declare the emancipation of some of his slaves. It marks, Wiencek believes, a moral epiphany in Washington's thinking, the moment he decided not only to emancipate his slaves but also to use the occasion to set the example Lafayette had urged in 1783. Other historians dispute Wiencek's conclusion; Henriques and Joseph Ellis concur with Philip Morgan's opinion that Washington experienced no epiphanies in a "long and hard-headed struggle" in which there was no single turning point. Morgan argues that Humphreys' passage is the "private expression of remorse" from a man unable to extricate himself from the "tangled web" of "mutual dependency" on slavery, and that Washington believed public comment on such a divisive subject was best avoided for the sake of national unity.

As president

Portrait painting
President George Washington by Gilbert Stuart (1795)

Washington took up the presidency at a time when revolutionary sentiment against slavery was giving way to a resurgence of proslavery interests. No state considered making slavery an issue during the ratification of the new constitution, southern states reinforced their slavery legislation and prominent antislavery figures were muted about the issue in public. Washington understood there was little widespread organized support for abolition. He had a keen sense both of the fragility of the fledgling Republic and of his place as a unifying figure, and he was determined not to endanger either by confronting an issue as divisive and entrenched as slavery. He was president of a government that passed a resolution in 1790 affirming states' rights to regulate treatment of slaves and legislate on slavery free of congressional interference, provided materiel and financial support for French efforts to suppress the Saint Domingue slave revolt in 1791 and implemented the proslavery Fugitive Slave Act of 1793. He also signed into law the Slave Trade Act of 1794 that sought to limit American involvement in the international slave trade. Washington never spoke publicly on the issue of slavery during his eight years as president, nor did he respond to, much less act upon, any of the antislavery petitions he received. He described a 1790 Quaker petition to Congress urging an immediate end to the slave trade as "an illjudged piece of business" that "occasioned a great waste of time." The issue of slavery was not mentioned in either his last address to Congress or his Farewell Address.

Late in his presidency, Washington told his Secretary of State, Edmund Randolph, that in the event of a confrontation between North and South, he had "made up his mind to remove and be of the Northern." In 1798, he imagined just such a conflict when he said, "I can clearly foresee that nothing but the rooting out of slavery can perpetuate the existence of our union." But there is no indication Washington ever favored an immediate end to slavery. His abolitionist aspirations for the nation were confined to the hope that slavery would disappear naturally over time with the prohibition of slave imports in 1808, the earliest date such legislation could be passed as agreed at the Constitutional Convention.

As Virginia farmer

As well as political caution, economic imperatives remained an important consideration with regard to Washington's personal position as a slaveholder and his efforts to free himself from his dependency on slavery. He was one of the largest debtors in Virginia at the end of the war, and by 1787 the business at Mount Vernon had failed to make a profit for more than a decade. Persistently poor crop yields due to pestilence and poor weather, the cost of renovations at his Mount Vernon residence, the expense of entertaining a constant stream of visitors, the failure of Lund to collect rent from Washington's tenant farmers and wartime depreciation all helped to make Washington cash poor.

It is demonstrably clear that on this Estate I have more working Negroes by a full moiety, than can be employed to any advantage in the farming system; and I shall never turn to Planter thereon...To sell the surplus I cannot, because I am principled against this kind of traffic in the human species...
George Washington to Robert Lewis, August 17, 1799

The overheads of maintaining a surplus of slaves, including the care of the young and elderly, made a substantial contribution to his financial difficulties. In 1786, the ratio of productive to non-productive slaves was approaching 1:1, and the c. 7,300-acre (3,000 ha) Mount Vernon estate was being operated with 122 working slaves. Although the productive/non-productive ratio had improved by 1799 to around 2:1, the Mount Vernon estate had grown by only 10 percent to some 8,000 acres (3,200 ha) while the working slave population had grown by 65 percent to 201. It was a trend that threatened to bankrupt Washington. The slaves Washington had bought early in the development of his business were beyond their prime and nearly impossible to sell, and from 1782 Virginia law made slaveowners liable for the financial support of slaves they freed who were too young, too old or otherwise incapable of working.

During his second term, Washington began planning for a retirement that would provide him "tranquillity with a certain income." In December 1793, he sought the aid of the British agriculturalist Arthur Young in finding farmers to whom he would lease all but one of his farms, on which his slaves would then be employed as laborers. The next year, he instructed his secretary Tobias Lear to sell his western lands, ostensibly to consolidate his operations and put his financial affairs in order. Washington concluded his instructions with a private passage in which he expressed repugnance at owning slaves and declared that the principal reason for selling the land was to raise the finances that would allow him to liberate them. It is the first clear indication that Washington's thinking had shifted from selling his slaves to freeing them. In November the same year, Washington declared in a letter to his friend and neighbor Alexander Spotswood that he was "...principled agt. [sic] selling Negroes, as you would Cattle in the market..."

In 1795 and 1796, Washington devised a complicated plan that involved renting out his western lands to tenant farmers to whom he would lease his own slaves, and a similar scheme to lease the dower slaves he controlled to Dr. David Stuart for work on Stuart's Eastern Shore plantation. This plan would have involved breaking up slave families, but it was designed with an end goal of raising enough finances to fund their eventual emancipation (a detail Washington kept secret) and prevent the Custis heirs from permanently splitting up families by sale. None of these schemes could be realized because of his failure to sell or rent land at the right prices, the refusal of the Custis heirs to agree to them and his own reluctance to separate families. Wiencek speculates that, because Washington gave such serious consideration to freeing his slaves knowing full well the political ramifications that would follow, one of his goals was to make a public statement that would sway opinion towards abolition. Philip Morgan argues that Washington freeing his slaves while President in 1794 or 1796 would have had no profound effect, and would have been greeted with public silence and private derision by white southerners.

As Washington subordinated his desire for emancipation to his efforts to secure financial independence, he took care to retain his slaves. From 1791, he arranged for those who served in his personal retinue in Philadelphia while he was President to be rotated out of the state before they became eligible for emancipation after six months residence per Pennsylvanian law. Not only would Washington have been deprived of their services if they were freed, most of the slaves he took with him to Philadelphia were dower slaves, which meant that he would have had to compensate the Custis estate for the loss. Because of his concerns for his public image and that the prospect of emancipation would generate discontent among the slaves before they became eligible for emancipation, he instructed that they be shuffled back to Mount Vernon "under pretext that may deceive both them and the Public."

Washington spared no expense in efforts to recover Hercules and Judge when they absconded. In Judge's case, Washington persisted for three years. He tried to persuade her to return when his agent eventually tracked her to New Hampshire, but refused to promise her freedom after his death; "However well disposed I might be to a gradual emancipation," he said, "or even to an entire emancipation of that description of People (if the latter was in itself practicable at this moment) it would neither be politic or just to reward unfaithfulness with a premature preference." Both Hercules and Judge eluded capture. Washington's search for a new chef to replace Hercules in 1797 is the last known instance in which he considered buying a slave, despite his resolve "never to become the Master of another Slave by purchase"; in the end he chose to hire a white chef.

Posthumous emancipation

newspaper clipping
Washington's will published in the Connecticut Journal, February 20, 1800

In July 1799, five months before his death, Washington wrote his will, in which he stipulated that his slaves should be freed. In the months that followed, he considered a plan that betrayed a continuing prioritization of profit above his concerns about the institution of slavery. The plan involved repossessing tenancies in Berkeley and Frederick Counties and transferring half of his Mount Vernon slaves to work them. It would, Washington hoped, "yield more nett profit" which might "benefit myself and not render the [slaves'] condition worse", despite the disruption such relocation would have had on the slave families. The plan died with Washington on December 14, 1799.

Washington's slaves were the subjects of the longest provisions in the twenty-nine-page will, taking three pages in which his instructions were more forceful than in the rest of the document. His valet, William Lee, was freed immediately and his remaining 123 slaves were to be emancipated on the death of Martha. The deferral was intended to postpone the pain of separation that would occur when his slaves were freed but their spouses among the dower slaves remained in bondage, a situation which affected twenty couples and their children. It is possible Washington hoped Martha and her heirs who would inherit the dower slaves would solve this problem by following his example and emancipating them. Those too old or infirm to work were to be supported by his estate, as mandated by state law.

Washington went beyond the legal requirement to support and maintain younger slaves until adulthood, stipulating that those children whose education could not be undertaken by parents were to be taught reading, writing and a useful trade by their masters and then be freed at the age of twenty-five. He was particularly pointed in forbidding the sale or transportation of any of his slaves out of Virginia before their emancipation. Including the Dandridge slaves, who were to be emancipated under similar terms, more than 160 slaves would be freed. Although Washington was not alone among Virginian slaveowners in freeing their slaves, he was unusual for doing it so late, after the post-revolutionary support for emancipation in Virginia had faded. He was also unusual for being the only slaveowning Founding Father to do so.

Aftermath

Photograph
Slave burial ground memorial at Mount Vernon

Any hopes Washington may have had that his example and prestige would influence the thinking of others, including his own family, proved to be unfounded. His action was ignored by southern slaveholders, and slavery continued at Mount Vernon. Already from 1795, dower slaves were being transferred to Martha's three granddaughters as the Custis heirs married. Martha felt threatened by the fact that she was surrounded with slaves whose freedom depended on her death and freed her late husband's slaves on January 1, 1801.

Able-bodied slaves were freed and left to support themselves and their families. Within a few months, almost all of Washington's former slaves had left Mount Vernon, leaving 121 adult and working-age children still working the estate. Five freedwomen were listed as remaining: an unmarried mother of two children; two women, one of them with three children, married to Washington slaves too old to work; and two women who were married to dower slaves. William Lee remained at Mount Vernon, where he worked as a shoemaker. After Martha's death on May 22, 1802, most of the remaining dower slaves passed to her grandson, George Washington Parke Custis, to whom she bequeathed the only slave she held in her own name.

There are few records of how the newly freed slaves fared. Custis later wrote that "although many of them, with a view to their liberation, had been instructed in mechanic trades, yet they succeeded very badly as freemen; so true is the axiom, 'that the hour which makes man a slave, takes half his worth away'." The son-in-law of Custis's sister wrote in 1853 that the descendants of those who remained slaves, many of them now in his possession, had been "prosperous, contented and happy," while those who had been freed had led a life of "vice, dissipation and idleness" and had, in their "sickness, age and poverty", become a burden to his in-laws. Such reports were influenced by the innate racism of the well-educated, upper-class authors and ignored the social and legal impediments that prejudiced the chances of prosperity for former slaves, which included laws that made it illegal to teach freedpeople to read and write and, in 1806, required newly freed slaves to leave the state.

There is evidence that some of Washington's former slaves were able to buy land, support their families and prosper as free people. By 1812, Free Town in Truro Parish, the earliest known free African-American settlement in Fairfax County, contained seven households of former Washington slaves. By the mid 1800s, a son of Washington's carpenter Davy Jones and two grandsons of his postilion Joe Richardson had each bought land in Virginia. Francis Lee, younger brother of William, was well known and respected enough to have his obituary printed in the Alexandria Gazette on his death at Mount Vernon in 1821. Sambo Anderson – who hunted game, as he had while Washington's slave, and prospered for a while by selling it to the most respectable families in Alexandria – was similarly noted by the Gazette when he died near Mount Vernon in 1845. Research published in 2019 has concluded that Hercules worked as a cook in New York, where he died on May 15, 1812.

A decade after Washington's death, the Pennsylvanian jurist Richard Peters wrote that Washington's servants "were devoted to him; and especially those more immediately about his person. The survivors of them still venerate and adore his memory." In his old age, Anderson said he was "a much happier man when he was a slave than he had ever been since," because he then "had a good kind master to look after all my wants, but now I have no one to care for me." When Judge was interviewed in the 1840s, she expressed considerable bitterness, not at the way she he had been treated as a slave, but at the fact that she had been enslaved. When asked, having experienced the hardships of being a freewoman and having outlived both husband and children, whether she regretted her escape, she replied, "No, I am free, and have, I trust, been made a child of God by [that] means."

Political legacy

Washington's will was both private testament and public statement on the institution. It was published widely – in newspapers nationwide, as a pamphlet which, in 1800 alone, extended to thirteen separate editions, and included in other works – and became part of the nationalist narrative. In the eulogies of the antislavery faction, the inconvenient fact of Washington's slaveholding was downplayed in favor of his final act of emancipation. Washington "disdained to hold his fellow-creatures in abject domestic servitude," wrote the Massachusetts Federalist Timothy Bigelow before calling on "fellow-citizens in the South" to emulate Washington's example. In this narrative, Washington was a proto-abolitionist who, having added the freedom of his slaves to the freedom from British slavery he had won for the nation, would be mobilized to serve the antislavery cause.

An alternative narrative more in line with proslavery sentiments embraced rather than excised Washington's ownership of slaves. Washington was cast as a paternal figure, the benevolent father not only of his country but also of a family of slaves bound to him by affection rather than coercion. In this narrative, slaves idolized Washington and wept at his deathbed, and in an 1807 biography, Aaron Bancroft wrote, "In domestick [sic] and private life, he blended the authority of the master with the care and kindness of the guardian and friend." The competing narratives allowed both North and South to claim Washington as the father of their countries during the American Civil War that ended slavery more than half a century after his death.

Memorial

In 1929, a plaque was embedded in the ground at Mount Vernon less than 50 yards (45 m) from the crypt housing the remains of Washington and Martha, marking a plot neglected by both groundsmen and tourist guides where slaves had been buried in unmarked graves. The inscription read, "In memory of the many faithful colored servants of the Washington family, buried at Mount Vernon from 1760 to 1860. Their unidentified graves surround this spot." The site remained untended and ignored in the visitor literature until the Mount Vernon Ladies' Association erected a more prominent monument surrounded with plantings and inscribed, "In memory of the Afro Americans who served as slaves at Mount Vernon this monument marking their burial ground dedicated September 21, 1983." In 1985, a ground-penetrating radar survey identified sixty-six possible burials. As of late 2017, an archaeological project begun in 2014 has identified, without disturbing the contents, sixty-three burial plots in addition to seven plots known before the project began.

Thursday, June 18, 2020

Railgun

From Wikipedia, the free encyclopedia

Naval Surface Warfare Center test firing in January 2008

A railgun is a device, typically designed as a weapon, that uses electromagnetic force to launch high velocity projectiles. The projectile normally does not contain explosives, instead relying on the projectile's high speed and kinetic energy to inflict damage. The railgun uses a pair of parallel conductors (rails), along which a sliding armature is accelerated by the electromagnetic effects of a current that flows down one rail, into the armature and then back along the other rail. It is based on principles similar to those of the homopolar motor.

As of 2020, railguns have been researched as weapons utilising electromagnetic forces to impart a very high kinetic energy to a projectile (e.g. APFSDS) rather than using conventional propellants. While explosive-powered military guns cannot readily achieve a muzzle velocity of more than ≈2 km/s, railguns can readily exceed 3 km/s. For a similar projectile, the range of railguns may exceed that of conventional guns. The destructive force of a projectile depends on its kinetic energy at the point of impact and due to the potentially high velocity of a railgun-launched projectile, their destructive force may be much greater than conventionally launched projectiles of the same size. The absence of explosive propellants or warheads to store and handle, as well as the low cost of projectiles compared to conventional weaponry, come as additional advantages.

Notwithstanding the above advantages, railguns are still very much at the research stage after decades of R&D, and it remains to be seen whether or not they will ever be deployed as practical military weapons. Any trade-off analysis between electromagnetic (EM) propulsion systems and chemical propellants for weapons applications must also factor in its durability, availability and economics, as well as the novelty, bulkiness, high energy demand and complexity of the pulsed power supplies that are needed for electromagnetic launcher systems. 

In addition to military applications, NASA has proposed to use a railgun to launch "wedge-shaped aircraft with scramjets" to high-altitude at Mach 10, where they will then fire a small payload into orbit using conventional rocket propulsion. The extreme g-forces involved with direct railgun ground-launch to space may restrict the usage to only the sturdiest of payloads. Alternatively, very long rail systems may be used to reduce the required launch acceleration.

Basics

The railgun in its simplest form differs from a traditional electric motor in that no use is made of additional field windings (or permanent magnets). This basic configuration is formed by a single loop of current and thus requires high currents (e.g., of order one million amperes) to produce sufficient accelerations (and muzzle velocities). A relatively common variant of this configuration is the augmented railgun in which the driving current is channelled through additional pairs of parallel conductors, arranged to increase ('augment') the magnetic field experienced by the moving armature. These arrangements reduce the current required for a given acceleration. In electric motor terminology, augmented railguns are usually series-wound configurations. Some railguns also use strong neodymium magnets with the field perpendicular to the current flow to increase the force on the projectile.

The armature may be an integral part of the projectile, but it may also be configured to accelerate a separate, electrically isolated or non-conducting projectile. Solid, metallic sliding conductors are often the preferred form of railgun armature but plasma or 'hybrid' armatures can also be used. A plasma armature is formed by an arc of ionised gas that is used to push a solid, non-conducting payload in a similar manner to the propellant gas pressure in a conventional gun. A hybrid armature uses a pair of plasma contacts to interface a metallic armature to the gun rails. Solid armatures may also 'transition' into hybrid armatures, typically after a particular velocity threshold is exceeded.

A railgun requires a pulsed DC power supply. For potential military applications, railguns are usually of interest because they can achieve much greater muzzle velocities than guns powered by conventional chemical propellants. Increased muzzle velocities with better aerodynamically streamlined projectiles can convey the benefits of increased firing ranges while, in terms of target effects, increased terminal velocities can allow the use of kinetic energy rounds incorporating hit-to-kill guidance, as replacements for explosive shells. Therefore, typical military railgun designs aim for muzzle velocities in the range of 2,000–3,500 m/s (4,500–7,800 mph; 7,200–12,600 km/h) with muzzle energies of 5–50 megajoules (MJ). For comparison, 50 MJ is equivalent to the kinetic energy of a school bus weighing 5 metric tons, travelling at 509 km/h (316 mph; 141 m/s). For single loop railguns, these mission requirements require launch currents of a few million amperes, so a typical railgun power supply might be designed to deliver a launch current of 5 MA for a few milliseconds. As the magnetic field strengths required for such launches will typically be approximately 10 tesla (100 kilogauss), most contemporary railgun designs are effectively air-cored, i.e., they do not use ferromagnetic materials such as iron to enhance the magnetic flux. However, if the barrel is made of a magnetically permeable material, the magnetic field strength increases due to the increase in permeability (μ = μ0*μr, where μ is the effective permeability, μ0 is the permeability constant and μr is the relative permeability of the barrel). This automatically increases the force. 

Railgun velocities generally fall within the range of those achievable by two-stage light-gas guns; however, the latter are generally only considered to be suitable for laboratory use, while railguns are judged to offer some potential prospects for development as military weapons. Another light gas gun, the Combustion Light Gas Gun in a 155 mm prototype form was projected to achieve 2500 m/s with a .70 caliber barrel. In some hypervelocity research projects, projectiles are 'pre-injected' into railguns, to avoid the need for a standing start, and both two-stage light-gas guns and conventional powder guns have been used for this role. In principle, if railgun power supply technology can be developed to provide safe, compact, reliable, combat survivable, and lightweight units, then the total system volume and mass needed to accommodate such a power supply and its primary fuel can become less than the required total volume and mass for a mission equivalent quantity of conventional propellants and explosive ammunition. Arguably such technology has been matured with the introduction of the Electromagnetic Aircraft Launch System (EMALS) (albeit that railguns require much higher system powers, because roughly similar energies must be delivered in a few milliseconds, as opposed to a few seconds). Such a development would then convey a further military advantage in that the elimination of explosives from any military weapons platform will decrease its vulnerability to enemy fire.

History

German railgun diagrams

The concept of the railgun was first introduced by French inventor Andre Louis Octave Fauchon-Villeplee, who created a small working model in 1917 with the help of the Société anonyme des accumulateurs Tudor (now Tudor Batteries). During World War I, the Director of Inventions at the Ministry of Armaments, Jules-Louis Brenton, commissioned Fauchon-Villeplee to develop a 30-mm to 50-mm electric cannon on July 25, 1918 after delegates from the Commission des Inventions witnessed test trials of the working model in 1917. However, the project was abandoned once World War I ended later that year on November 3, 1918. Fauchon-Villeplee filed for a US patent on 1 April 1919, which was issued in July 1922 as patent no. 1,421,435 "Electric Apparatus for Propelling Projectiles". In his device, two parallel busbars are connected by the wings of a projectile, and the whole apparatus surrounded by a magnetic field. By passing current through busbars and projectile, a force is induced which propels the projectile along the bus-bars and into flight.

In 1923, Russian scientist A. L. Korol’kov detailed his criticisms of Fauchon-Villeplee's design, arguing against some of the claims that Fauchon-Villeplee made about the advantages of his invention. Korol’kov eventually concluded that while the construction of a long-range electric gun was within the realm of possibility, the practical application of Fauchon-Villeplee's railgun was hindered by its enormous electric energy consumption and its need for a special electric generator of considerable capacity to power it.

In 1944, during World War II, Joachim Hänsler of Nazi Germany's Ordnance Office proposed the first theoretically viable railgun. By late 1944, the theory behind his electric anti-aircraft gun had been worked out sufficiently to allow the Luftwaffe's Flak Command to issue a specification, which demanded a muzzle velocity of 2,000 m/s (4,500 mph; 7,200 km/h; 6,600 ft/s) and a projectile containing 0.5 kg (1.1 lb) of explosive. The guns were to be mounted in batteries of six firing twelve rounds per minute, and it was to fit existing 12.8 cm FlaK 40 mounts. It was never built. When details were discovered after the war it aroused much interest and a more detailed study was done, culminating with a 1947 report which concluded that it was theoretically feasible, but that each gun would need enough power to illuminate half of Chicago.

During 1950, Sir Mark Oliphant, an Australian physicist and first director of the Research School of Physical Sciences at the new Australian National University, initiated the design and construction of the world's largest (500 megajoule) homopolar generator. This machine was operational from 1962 and was later used to power a large-scale railgun that was used as a scientific experiment.

In 1980, the Ballistic Research Laboratory (later consolidated to form the U.S. Army Research Laboratory) began a long-term program of theoretical and experimental research on railguns. The work was conducted predominantly at the Aberdeen Proving Ground, and much of the early research drew inspiration from the railgun experiments performed by the Australian National University. Topics of research included plasma dynamics, electromagnetic fields, telemetry, and current and heat transport. While military research into railgun technology in the United States ensued continuously in the following decades, the direction and focus that it took shifted dramatically with major changes in funding levels and the needs of different government agencies. In 1984, the formation of the Strategic Defense Initiative Organization caused research goals to shift toward establishing a constellation of satellites to intercept intercontinental ballistic missiles. As a result, the U.S. military focused on developing small guided projectiles that could withstand the high-G launch from ultra-high velocity plasma armature railguns. But after the publication of an important Defense Science Board study in 1985, the U.S. Army, Marine Corps, and DARPA were assigned to develop anti-armor, electromagnetic launch technologies for mobile ground combat vehicles. In 1990, the U.S. Army collaborated with the University of Texas at Austin to establish the Institute for Advanced Technology (IAT), which focused on research involving solid and hybrid armatures, rail-armature interactions, and electromagnetic launcher materials. The facility became the Army's first Federally Funded Research and Development Center and housed a few of the Army's electromagnetic launchers, such as the Medium Caliber Launcher.

Since 1993 the British and American governments have collaborated on a railgun project at the Dundrennan Weapons Testing Centre that culminated in the 2010 test where BAE Systems fired a 3.2 kg (7 pound) projectile at 18.4-megajoules [3,390 m/s (7,600 mph; 12,200 km/h; 11,100 ft/s)]. In 1994, India's DRDO's Armament Research and Development Establishment developed a railgun with a 240 kJ, low inductance capacitor bank operating at 5 kV power able to launch projectiles of 3–3.5 g weight to a velocity of more than 2,000 m/s (4,500 mph; 7,200 km/h; 6,600 ft/s). In 1995, the Center for Electromagnetics at the University of Texas at Austin designed and developed a rapid-fire railgun launcher called the Cannon-Caliber Electromagnetic Gun. The launcher prototype was later tested at the U.S. Army Research Laboratory, where it demonstrated a breech efficiency over 50 percent.

In 2010, the United States Navy tested a BAE Systems-designed compact-sized railgun for ship emplacement that accelerated a 3.2 kg (7 pound) projectile to hypersonic velocities of approximately 3,390 m/s (7,600 mph; 12,200 km/h; 11,100 ft/s), or about Mach 10, with 18.4 MJ of kinetic energy. It was the first time in history that such levels of performance were reached. They gave the project the motto "Velocitas Eradico", Latin for "I, [who am] speed, eradicate"—or in the vernacular, "Speed Kills". An earlier railgun of the same design (32-megajoules) resides at the Dundrennan Weapons Testing Centre in the United Kingdom.

Low power, small scale railguns have also made popular college and amateur projects. Several amateurs actively carry out research on railguns. No practical railgun weapon has been developed or is expected in the near-future as of January 2020.

Design

Theory

A railgun consists of two parallel metal rails (hence the name). At one end, these rails are connected to an electrical power supply, to form the breech end of the gun. Then, if a conductive projectile is inserted between the rails (e.g. by insertion into the breech), it completes the circuit. Electrons flow from the negative terminal of the power supply up the negative rail, across the projectile, and down the positive rail, back to the power supply.

This current makes the railgun behave as an electromagnet, creating a magnetic field inside the loop formed by the length of the rails up to the position of the armature. In accordance with the right-hand rule, the magnetic field circulates around each conductor. Since the current is in the opposite direction along each rail, the net magnetic field between the rails (B) is directed at right angles to the plane formed by the central axes of the rails and the armature. In combination to all with the current (I) in the armature, this produces a Lorentz force which accelerates the projectile along the rails, always out of the loop (regardless of supply polarity) and away from the power supply, towards the muzzle end of the rails. There are also Lorentz forces acting on the rails and attempting to push them apart, but since the rails are mounted firmly, they cannot move. 

By definition, if a current of one ampere flows in a pair of ideal infinitely long parallel conductors that are separated by a distance of one meter, then the magnitude of the force on each meter of those conductors will be exactly 0.2 micro-newtons. Furthermore, in general, the force will be proportional to the square of the magnitude of the current and inversely proportional to the distance between the conductors. It also follows that, for railguns with projectile masses of a few kg and barrel lengths of a few m, very large currents will be required to accelerate projectiles to velocities of the order of 1000 m/s.

A very large power supply, providing on the order of one million amperes of current, will create a tremendous force on the projectile, accelerating it to a speed of many kilometres per second (km/s). Although these speeds are possible, the heat generated from the propulsion of the object is enough to erode the rails rapidly. Under high-use conditions, current railguns would require frequent replacement of the rails, or to use a heat-resistant material that would be conductive enough to produce the same effect. At this time it is generally acknowledged that it will take major breakthroughs in materials science and related disciplines to produce high-powered railguns capable of firing more than a few shots from a single set of rails. The barrel must withstand these conditions for up to several rounds per minute for thousands of shots without failure or significant degradation. These parameters are well beyond the state of the art in materials science.

Mathematical formula

This section presents some elementary analysis of the fundamental theoretical electromagnetic principles that govern the mechanics of railguns. 

If a railgun were to provide a uniform magnetic field of strength , oriented at right angles to both the armature and the bore axis, then, with an armature current and an armature length , the force accelerating the projectile would be given by the formula:
Here the force, current and field are all treated as vectors, so the above vector cross product gives a force directed along the bore axis, acting on the current in the armature, as a consequence of the magnetic field.

In most simple railguns, the magnetic field is only provided by the current flowing in the rails, i.e. behind the armature. It follows that the magnetic field will neither be constant nor spatially uniform. Hence, in practice, the force must be calculated after making due allowances for the spatial variation of the magnetic field over the volume of the armature. 

To illustrate the principles involved, it can be useful to consider the rails and the armature as thin wires or "filaments". With this approximation, the magnitude of the force vector can be determined from a form of the Biot–Savart law and a result of the Lorentz force. The force can be derived mathematically in terms of the permeability constant (), the radius of the rails (which are assumed to be circular in cross section) (), the distance between the central axes of the rails () and the current () as described below.

First, it can be shown from the Biot–Savart law that at one end of a semi-infinite current-carrying wire, the magnetic field at a given perpendicular distance () from the end of the wire is given by
Note this is if the wire runs from the location of the armature e.g. from x = 0 back to and is measured relative to the axis of the wire. 

So, if the armature connects the ends of two such semi-infinite wires separated by a distance, , a fairly good approximation assuming the length of the wires is much larger than , the total field from both wires at any point on the armature is:

where is the perpendicular distance from the point on the armature to the axis of one of the wires.
Note that between the rails is assuming the rails are lying in the xy plane and run from x = 0 back to as suggested above.

Next, to evaluate the force on the armature, the above expression for the magnetic field on the armature can be used in conjunction with the Lorentz Force Law, 

To give the force as

This shows that the force will be proportional to the product of and the square of the current, . Because the value of μ0 is small (4π×10−7 H/m) it follows that powerful railguns need large driving currents. 

The above formula is based on the assumption that the distance () between the point where the force () is measured and the beginning of the rails is greater than the separation of the rails () by a factor of about 3 or 4 (). Some other simplifying assumptions have also been made; to describe the force more accurately, the geometry of the rails and the projectile must be considered.

With most practical railgun geometries, it is not easy to produce an electromagnetic expression for the railgun force that is both simple and reasonably accurate. For a more workable simple model, a useful alternative is to use a lumped circuit model, to describe the relationship between the driving current and the railgun force.

In these models the railgun is modeled on an electrical circuit and the driving force can be determined from the energy flow in the circuit. The voltage across the railgun breech is given by
So the total power flowing into the railgun is then simply the product . This power represents an energy flow into three main forms: kinetic energy in the projectile and armature, energy stored in the magnetic field, and energy lost via electrical resistance heating of the rails (and armature). 

As the projectile travels along the barrel, the distance from the breech to the armature increases. Hence the resistance and inductance of the barrel also increase. For a simple model, the barrel resistance and inductance can be assumed to vary as linear functions of the projectile position, , so these quantities are modelled as
where is the resistance per unit length and is the inductance per unit length, or the inductance gradient. It follows that
where is the all-important projectile velocity, . Then
Now, if the driving current is held constant, the term will be zero. Resistive losses now correspond to a power flow , while the power flow represents the electromagnetic work done.

This simple model predicts that exactly half of the electromagnetic work will be used to store energy in the magnetic field along the barrel, , as the length of the current loop increases.

The other half of the electromagnetic work represents the more useful power flow - into the kinetic energy of the projectile. Since power can be expressed as force times speed, this shows the force on the railgun armature is given by
This equation also shows that high accelerations will require very high currents. For an ideal square bore single-turn railgun, the value of would be about 0.6 microHenries per metre (μH/m) but most practical railgun barrels exhibit lower values of than this. Maximizing the inductance gradient is but one of the challenges faced by the designers of railgun barrels.

Since the lumped circuit model describes the railgun force in terms of fairly normal circuit equations, it becomes possible to specify a simple time domain model of a railgun. 5yg Ignoring friction and air drag, the projectile acceleration is given by
where m is the projectile mass. The motion along the barrel is given by
and the above voltage and current terms can be placed into appropriate circuit equations to determine the time variation of current and voltage. 

It can also be noted that the textbook formula for the high frequency inductance per unit length of a pair of parallel round wires, of radius r and axial separation d is:
So the lumped parameter model also predicts the force for this case as:
With practical railgun geometries, much more accurate two or three dimensional models of the rail and armature current distributions (and the associated forces) can be computed, e.g., by using finite element methods to solve formulations based on either the scalar magnetic potential or the magnetic vector potential.

Design considerations

The power supply must be able to deliver large currents, sustained and controlled over a useful amount of time. The most important gauge of power supply effectiveness is the energy it can deliver. As of December 2010, the greatest known energy used to propel a projectile from a railgun was 33 megajoules. The most common forms of power supplies used in railguns are capacitors and compulsators which are slowly charged from other continuous energy sources.

The rails need to withstand enormous repulsive forces during shooting, and these forces will tend to push them apart and away from the projectile. As rail/projectile clearances increase, arcing develops, which causes rapid vaporization and extensive damage to the rail surfaces and the insulator surfaces. This limited some early research railguns to one shot per service interval. 

The inductance and resistance of the rails and power supply limit the efficiency of a railgun design. Currently different rail shapes and railgun configurations are being tested, most notably by the U.S. Navy (Naval Research Laboratory), the Institute for Advanced Technology at the University of Texas at Austin, and BAE Systems.

Materials used

The rails and projectiles must be built from strong conductive materials; the rails need to survive the violence of an accelerating projectile, and heating due to the large currents and friction involved. Some erroneous work has suggested that the recoil force in railguns can be redirected or eliminated; careful theoretical and experimental analysis reveals that the recoil force acts on the breech closure just as in a chemical firearm. The rails also repel themselves via a sideways force caused by the rails being pushed by the magnetic field, just as the projectile is. The rails need to survive this without bending and must be very securely mounted. Currently published material suggests that major advances in material science must be made before rails can be developed that allow railguns to fire more than a few full-power shots before replacement of the rails is required.

Heat dissipation

In current designs massive amounts of heat are created by the electricity flowing through the rails, as well as by the friction of the projectile leaving the device. This causes three main problems: melting of equipment, decreased safety of personnel, and detection by enemy forces due to increased infrared signature. As briefly discussed above, the stresses involved in firing this sort of device require an extremely heat-resistant material. Otherwise the rails, barrel, and all equipment attached would melt or be irreparably damaged.

In practice, the rails used with most railgun designs are subject to erosion from each launch. Additionally, projectiles can be subject to some degree of ablation, and this can limit railgun life, in some cases severely.

Applications

Railguns have a number of potential practical applications, primarily for the military. However, there are other theoretical applications currently being researched.

Launch or launch assist of spacecraft

Electrodynamic assistance to launch rockets has been studied. Space applications of this technology would likely involve specially formed electromagnetic coils and superconducting magnets. Composite materials would likely be used for this application.

For space launches from Earth, relatively short acceleration distances (less than a few km) would require very strong acceleration forces, higher than humans can tolerate. Other designs include a longer helical (spiral) track, or a large ring design whereby a space vehicle would circle the ring numerous times, gradually gaining speed, before being released into a launch corridor leading skyward. Nevertheless, if technically feasible and cost effective to build, imparting hyper-velocity escape velocity to a projectile launching at sea level, where the atmosphere is the most dense, may result in much of the launch velocity being lost to aerodynamic drag. In addition, the projectile might still require some form of on-board guidance and control to realize a useful orbital insertion angle that may not be achievable based simply on the launcher's upward elevation angle relative to the surface of the earth.

In 2003, Ian McNab outlined a plan to turn this idea into a realized technology. Because of strong acceleration, this system would launch only sturdy materials, such as food, water, and – most importantly – fuel. Under ideal circumstances (equator, mountain, heading east) the system would cost $528/kg, compared with $5,000/kg on the conventional rocket. The McNab railgun could make approximately 2000 launches per year, for a total of maximum 500 tons launched per year. Because the launch track would be 1.6 km long, power will be supplied by a distributed network of 100 rotating machines (compulsator) spread along the track. Each machine would have a 3.3-ton carbon fibre rotor spinning at high speeds. A machine can recharge in a matter of hours using 10 MW power. This machine could be supplied by a dedicated generator. The total launch package would weigh almost 1.4 tons. Payload per launch in these conditions is over 400 kg. There would be a peak operating magnetic field of 5 T—half of this coming from the rails, and the other half from augmenting magnets. This halves the required current through the rails, which reduces the power fourfold.

Weaponry

Drawings of electric gun projectiles
 
Electromagnetic Railgun located at the Naval Surface Warfare Center
 
Railguns are being researched as weapons with projectiles that do not contain explosives or propellants, but are given extremely high velocities: 2,500 m/s (8,200 ft/s) (approximately Mach 7 at sea level) or more. For comparison, the M16 rifle has a muzzle speed of 930 m/s (3,050 ft/s), and the 16"/50 caliber Mark 7 gun that armed World War II American battleships has a muzzle speed of 760 m/s (2,490 ft/s)), which because of its much greater projectile mass (up to 2,700 pounds) generated a muzzle energy of 360 MJ and a downrange kinetic impact of energy of over 160 MJ (see also Project HARP). By firing smaller projectiles at extremely high velocities, railguns may yield kinetic energy impacts equal or superior to the destructive energy of 5"/54 caliber Mark 45 gun Naval guns, (which achieve up to 10MJ at the muzzle), but with greater range. This decreases ammunition size and weight, allowing more ammunition to be carried and eliminating the hazards of carrying explosives or propellants in a tank or naval weapons platform. Also, by firing more aerodynamically streamlined projectiles at greater velocities, railguns may achieve greater range, less time to target, and at shorter ranges less wind drift, bypassing the physical limitations of conventional firearms: "the limits of gas expansion prohibit launching an unassisted projectile to velocities greater than about 1.5 km/s and ranges of more than 50 miles [80 km] from a practical conventional gun system."

Current railgun technologies necessitate a long and heavy barrel, but a railgun's ballistics far outperform conventional cannons of equal barrel lengths. Railguns can also deliver area of effect damage by detonating a bursting charge in the projectile which unleashes a swarm of smaller projectiles over a large area.

Assuming that the many technical challenges facing fieldable railguns are overcome, including issues like railgun projectile guidance, rail endurance, and combat survivability and reliability of the electrical power supply, the increased launch velocities of railguns may provide advantages over more conventional guns for a variety of offensive and defensive scenarios. Railguns have limited potential to be used against both surface and airborne targets.

The first weaponized railgun planned for production, the General Atomics Blitzer system, began full system testing in September 2010. The weapon launches a streamlined discarding sabot round designed by Boeing's Phantom Works at 1,600 m/s (5,200 ft/s) (approximately Mach 5) with accelerations exceeding 60,000 gn. During one of the tests, the projectile was able to travel an additional 7 kilometres (4.3 mi) downrange after penetrating a 18 inch (3.2 mm) thick steel plate. The company hopes to have an integrated demo of the system by 2016 followed by production by 2019, pending funding. Thus far, the project is self-funded.

In October 2013, General Atomics unveiled a land based version of the Blitzer railgun. A company official claimed the gun could be ready for production in "two to three years".

Railguns are being examined for use as anti-aircraft weapons to intercept air threats, particularly anti-ship cruise missiles, in addition to land bombardment. A supersonic sea-skimming anti-ship missile can appear over the horizon 20 miles from a warship, leaving a very short reaction time for a ship to intercept it. Even if conventional defense systems react fast enough, they are expensive and only a limited number of large interceptors can be carried. A railgun projectile can reach several times the speed of sound faster than a missile; because of this, it can hit a target, such as a cruise missile, much faster and farther away from the ship. Projectiles are also typically much cheaper and smaller, allowing for many more to be carried (they have no guidance systems, and rely on the railgun to supply their kinetic energy, rather than providing it themselves). The speed, cost, and numerical advantages of railgun systems may allow them to replace several different systems in the current layered defense approach. A railgun projectile without the ability to change course can hit fast-moving missiles at a maximum range of 30 nmi (35 mi; 56 km). As is the case with the Phalanx CIWS, unguided railgun rounds will require multiple/many shots to bring down maneuvering supersonic anti-ship missiles, with the odds of hitting the missile improving dramatically the closer it gets. The Navy plans for railguns to be able to intercept endoatmospheric ballistic missiles, stealthy air threats, supersonic missiles, and swarming surface threats; a prototype system for supporting interception tasks is to be ready by 2018, and operational by 2025. This timeframe suggests the weapons are planned to be installed on the Navy's next-generation surface combatants, expected to start construction by 2028.

BAE Systems was at one point interested in installing railguns on their Future Combat Systems Manned Ground Vehicles. This program was the US Army's third attempt to replace the aging M2 Bradley.

India has successfully tested their own railgun. Russia, China, and Turkey's defence company ASELSAN  are also developing railguns.

Helical railgun

Helical railguns are multi-turn railguns that reduce rail and brush current by a factor equal to the number of turns. Two rails are surrounded by a helical barrel and the projectile or re-usable carrier is also helical. The projectile is energized continuously by two brushes sliding along the rails, and two or more additional brushes on the projectile serve to energize and commute several windings of the helical barrel direction in front of and/or behind the projectile. The helical railgun is a cross between a railgun and a coilgun. They do not currently exist in a practical, usable form. 

A helical railgun was built at MIT in 1980 and was powered by several banks of, for the time, large capacitors (approximately 4 farads). It was about 3 meters long, consisting of 2 meters of accelerating coil and 1 meter of decelerating coil. It was able to launch a glider or projectile about 500 meters.

Plasma railgun

A plasma railgun is a linear accelerator and a plasma energy weapon which, like a projectile railgun, uses two long parallel electrodes to accelerate a "sliding short" armature. However, in a plasma railgun, the armature and ejected projectile consists of plasma, or hot, ionized, gas-like particles, instead of a solid slug of material. MARAUDER (Magnetically Accelerated Ring to Achieve Ultra-high Directed Energy and Radiation) is, or was, a United States Air Force Research Laboratory project concerning the development of a coaxial plasma railgun. It is one of several United States Government efforts to develop plasma-based projectiles. The first computer simulations occurred in 1990, and its first published experiment appeared on August 1, 1993. As of 1993 the project appeared to be in the early experimental stages. The weapon was able to produce doughnut-shaped rings of plasma and balls of lightning that exploded with devastating effects when hitting their target. The project's initial success led to it becoming classified, and only a few references to MARAUDER appeared after 1993. The project may or may not have been scrapped some time after 1995.

Tests

Diagram showing the cross-section of a linear motor cannon

Full-scale models have been built and fired, including a 90 mm (3.5 in) bore, 9 megajoule kinetic energy gun developed by the US DARPA. Rail and insulator wear problems still need to be solved before railguns can start to replace conventional weapons. Probably the oldest consistently successful system was built by the UK's Defence Research Agency at Dundrennan Range in Kirkcudbright, Scotland. This system was established in 1993 and has been operated for over 10 years.
The Yugoslavian Military Technology Institute developed, within a project named EDO-0, a railgun with 7 kJ kinetic energy, in 1985. In 1987 a successor was created, project EDO-1, that used projectile with a mass of 0.7 kg (1.5 lb) and achieved speeds of 3,000 m/s (9,800 ft/s), and with a mass of 1.1 kg (2.4 lb) reached speeds of 2,400 m/s (7,900 ft/s). It used a track length of 0.7 m (2.3 ft). According to those working on it, with other modifications it was able to achieve a speed of 4,500 m/s (14,800 ft/s). The aim was to achieve projectile speed of 7,000 m/s (23,000 ft/s).

China is now one of the major players in electromagnetic launchers; in 2012 it hosted the 16th International Symposium on Electromagnetic Launch Technology (EML 2012) at Beijing. Satellite imagery in late 2010 suggested that tests were being conducted at an armor and artillery range near Baotou, in the Inner Mongolia Autonomous Region.

United States Armed Forces

The United States military have expressed interest in pursuing research in electric gun technology throughout the late 20th century due to how electromagnetic guns don't require propellants to fire a shot like conventional gun systems, significantly increasing crew safety and reducing logistics costs, as well as provide a greater range. In addition, railgun systems have shown to potentially provide higher velocity of projectiles, which would increase accuracy for anti-tank, artillery, and air defense by decreasing the time it takes for the projectile to reach its target destination. During the early 1990s, the U.S. Army dedicated more than $150 million into electric gun research. At the University of Texas at Austin Center for Electromechanics, military railguns capable of delivering tungsten armor-piercing bullets with kinetic energies of nine megajoules (9 MJ) have been developed. Nine megajoules is enough energy to deliver 2 kg (4.4 lb) of projectile at 3 km/s (1.9 mi/s)—at that velocity, a sufficiently long rod of tungsten or another dense metal could easily penetrate a tank, and potentially pass through it.

Naval Surface Warfare Center Dahlgren Division

The United States Naval Surface Warfare Center Dahlgren Division demonstrated an 8 MJ railgun firing 3.2 kg (7.1 lb) projectiles in October 2006 as a prototype of a 64 MJ weapon to be deployed aboard Navy warships. The main problem the U.S. Navy has had with implementing a railgun cannon system is that the guns wear out due to the immense pressures, stresses and heat that are generated by the millions of amperes of current necessary to fire projectiles with megajoules of energy. While not nearly as powerful as a cruise missile like a BGM-109 Tomahawk, that will deliver 3,000 MJ of destructive energy to a target, such weapons would, in theory, allow the Navy to deliver more granular firepower at a fraction of the cost of a missile, and will be much harder to shoot down versus future defensive systems. For context, another relevant comparison is the Rheinmetall 120mm gun used on main battle tanks, which generates 9 MJ of muzzle energy.

In 2007 BAE Systems delivered a 32 MJ prototype (muzzle energy) to the U.S. Navy. The same amount of energy is released by the detonation of 4.8 kg (11 lb) of C4.

On January 31, 2008, the U.S. Navy tested a railgun that fired a projectile at 10.64 MJ with a muzzle velocity of 2,520 m/s (8,270 ft/s). The power was provided by a new 9-megajoule prototype capacitor bank using solid-state switches and high-energy-density capacitors delivered in 2007 and an older 32-MJ pulse power system from the US Army's Green Farm Electric Gun Research and Development Facility developed in the late 1980s that was previously refurbished by General Atomics Electromagnetic Systems (EMS) Division. It is expected to be ready between 2020 and 2025.

A test of a railgun took place on December 10, 2010, by the U.S. Navy at the Naval Surface Warfare Center Dahlgren Division. During the test, the Office of Naval Research set a world record by conducting a 33 MJ shot from the railgun, which was built by BAE Systems.

A test took place in February 2012, at the Naval Surface Warfare Center Dahlgren Division. While similar in energy to the aforementioned test, the railgun used is considerably more compact, with a more conventional looking barrel. A General Atomics-built prototype was delivered for testing in October 2012.

In 2014 the U.S. Navy had plans to integrate a railgun that has a range of over 16 km (10 mi) onto a ship by 2016.[86] This weapon, while having a form factor more typical of a naval gun, will utilize components largely in common with those developed and demonstrated at Dahlgren. The hyper-velocity rounds weigh 10 kg (23 lb), are 18 in (460 mm), and are fired at Mach 7.

A future goal is to develop projectiles that are self-guided – a necessary requirement to hit distant targets or intercepting missiles. When the guided rounds are developed, the Navy is projecting each round to cost about $25,000, though developing guided projectiles for guns has a history of doubling or tripling initial cost estimates. Some high velocity projectiles developed by the Navy have command guidance, but the accuracy of the command guidance is not known, nor even if it can survive a full power shot.

Currently, the only U.S. Navy ships that can produce enough electrical power to get desired performance are the three Zumwalt-class destroyers (DDG-1000 series); they can generate 78 megawatts of power, more than is necessary to power a railgun. However, the Zumwalt has been cancelled and no further units will be built. Engineers are working to derive technologies developed for the DDG-1000 series ships into a battery system so other warships can operate a railgun. Most current destroyers can spare only nine megawatts of additional electricity, while it would require 25 megawatts to propel a projectile to the desired maximum range  (i.e., to launch 32MJ projectiles at a rate of 10 shots per minute). Even if current ships, such as the Arleigh Burke-class destroyer, can be upgraded with enough electrical power to operate a railgun, the space taken up on the ships by the integration of an additional weapon system may force the removal of existing weapon systems to make room available. The first shipboard tests was to be from a railgun installed on an Spearhead-class expeditionary fast transport (EPF), but this was later changed to land based testing.

Though the 23 lb projectiles have no explosives, their Mach 7 velocity gives them 32 megajoules of energy, but impact kinetic energy downrange will typically be 50 percent or less of the muzzle energy. The Navy is looking into other uses for railguns, besides land bombardment, such as air defense; with the right targeting systems, projectiles could intercept aircraft, cruise missiles, and even ballistic missiles. The Navy is also developing directed-energy weapons for air defense use, but it will be years or decades before they will be effective.

The railgun would be part of a Navy fleet that envisions future offensive and defensive capabilities being provided in layers: lasers to provide close range defense, railguns to provide medium range attack and defense, and cruise missiles to provide long-range attack; though railguns will cover targets up to 100 miles away that previously needed a missile. The Navy may eventually enhance railgun technology to enable it to fire at a range of 200 nmi (230 mi; 370 km) and impact with 64 megajoules of energy. One shot would require 6 million amps of current, so it will take a long time to develop capacitors that can generate enough energy and strong enough gun materials.

The most promising near-term application for weapons-rated railguns and electromagnetic guns, in general, is probably aboard naval ships with sufficient spare electrical generating capacity and battery storage space. In exchange, ship survivability may be enhanced through a comparable reduction in the quantities of potentially dangerous chemical propellants and explosives currently employed. Ground combat forces, however, may find that co-locating an additional electrical power supply on the battlefield for every gun system may not be as weight and space efficient, survivable, or convenient a source of immediate projectile-launching energy as conventional propellants, which are currently manufactured safely behind the lines and delivered to the weapon, pre-packaged, through a robust and dispersed logistics system.

In July, 2017, Defensetech reported that the Navy wants to push the Office of Naval Research's prototype railgun from a science experiment into useful weapon territory. The goal, according to Tom Beutner, head of Naval Air Warfare and Weapons for the ONR, is ten shots per minute at 32 megajoules. A 32 megajoule railgun shot is equivalent to about 23,600,000 foot-pounds, so a single 32 MJ shot has the same muzzle energy as about 200,000 .22 rounds being fired simultaneously. In more conventional power units, a 32 MJ shot every 6 s is a net power of 5.3 MW (or 5300 kW). If the railgun is assumed to be 20% efficient at turning electrical energy into kinetic energy, the ship's electrical supplies will need to provide about 25 MW for as long as firing continues.

Army Research Laboratory

Research on railgun technology served as a major area of focus at the Ballistic Research Laboratory (BRL) throughout the 1980s. In addition to analyzing the performance and electrodynamic and thermodynamic properties of railguns at other institutions (like Maxwell Laboratories’ CHECMATE railgun), BRL procured their own railguns for study such as their one-meter railgun and their four-meter rail gun. In 1984, BRL researchers devised a technique to analyze the residue left behind on the bore surface after a shot was fired in order to investigate the cause of the bore's progressive degradation. In 1991, they determined the properties required for developing an effective launch package as well as the design criteria necessary for a railgun to incorporate finned, long rod projectiles.

Research into railguns continued after the Ballistic Research Laboratory was consolidated with six other independent Army laboratories to form the U.S. Army Research Laboratory (ARL) in 1992. One of the major projects in railgun research that ARL was involved in was the Cannon-Caliber Electromagnetic Gun (CCEMG) program, which took place at the Center for Electromechanics at the University of Texas (UT-CEM) and was sponsored by the U.S. Marine Corps and the U.S. Army Armament Research Development and Engineering Center. As part of the CCEMG program, UT-CEM designed and developed the Cannon-Caliber Electromagnetic Launcher, a rapid-fire railgun launcher, in 1995. Featuring a 30-mm roundbore, the launcher was capable of firing three, five-round salvos of 185-g launch packages at a muzzle velocity of 1850 m/s and a firing rate of 5 Hz. Rapid-fire operation was achieved by driving the launcher with multiple 83544 peak pulses provided by the CCEMG compulsator. The CCEMG railgun included several features: ceramic sidewalls, directional preloading, and liquid cooling. ARL was responsible for assessing the performance of the launcher, which was tested at the ARL Transonic Experimental Facility in Aberdeen Proving Ground, MD.

The U.S. Army Research Laboratory also monitored electromagnetic and electrothermal gun technology development at the Institute for Advanced Technology (IAT) at the University of Texas at Austin, one of five university and industry laboratories that ARL federated to procure technical support. It housed the two electromagnetic launchers, the Leander OAT and the AugOAT, as well as the Medium Caliber Launcher. The facility also provided a power system that included thirteen 1- MJ capacitor banks, an assortment of electromagnetic launcher devices and diagnostic apparatuses. The focus of the research activity was on designs, interactions and materials required for electromagnetic launchers.

In 1999, a collaboration between ARL and IAT led to the development of a radiometric method of measuring the temperature distribution of railgun armatures during a pulsed electrical discharge without disturbing the magnetic field. In 2001, ARL became the first to obtain a set of accuracy data on electromagnetic gun-launched projectiles using jump tests. In 2004, ARL researchers published papers examining the interaction of high temperature plasmas for the purpose of developing efficient railgun igniters. Early papers describe the plasma-propellant interaction group at ARL and their attempts to understand and distinguish between the chemical, thermal, and radiation effect of plasmas on conventional solid propellants. Using scanning electron microscopy and other diagnostic techniques, they evaluated in detail the influence of plasmas on specific propellant materials.

People's Republic of China

China is developing its own railgun system. According to a CNBC report from U.S. intelligence, China's railgun system was first revealed in 2011, and ground testing began in 2014. In 2015 when the weapon system gained the ability to strike over extended ranges with increased lethality. The weapon system was successfully mounted on a Chinese Navy ship in December 2017, with sea trials happening later.

In early February 2018, pictures of what is claimed to be a Chinese railgun were published online. In the pictures the gun is mounted on the bow of a Type 072III-class landing ship Haiyangshan. Media suggests that the system is or soon will be ready for testing. In March 2018, it was reported that China confirmed it had begun testing its electromagnetic rail gun at sea.

India

In November 2017, India's Defence Research and Development Organisation carried out a successful test of a 12 mm square bore electromagnetic railgun. Tests of a 30 mm version are planned to be conducted. India aims to fire a one kilogram projectile at a velocity of more than 2,000 meters per second using a capacitor bank of 10 megajoules.

Issues

Major difficulties

Major technological and operational hurdles must be overcome before railguns can be deployed:
  1. Railgun durability: To date, railgun demonstrations, while impressive, have not demonstrated an ability to fire multiple full power shots from the same set of rails. The United States Navy has claimed hundreds of shots from the same set of rails. In a March 2014 statement to the Intelligence, Emerging Threats and Capabilities Subcommittee of the House Armed Services Committee, Chief of Naval Research Admiral Matthew Klunder stated, "Barrel life has increased from tens of shots to over 400, with a program path to achieve 1000 shots." However, the Office of Naval Research (ONR) will not confirm that the 400 shots are full-power shots. Further, there is nothing published to indicate there are any high megajoule-class railguns with the capability of firing hundreds of full-power shots while staying within the strict operational parameters necessary to fire railgun shots accurately and safely. Railguns should be able to fire 6 rounds per minute with a rail life of about 3000 rounds, tolerating launch accelerations of tens of thousands of g's, extreme pressures and megaampere currents, however this is not feasible with current technology.
  2.  
  3. Projectile guidance: A future capability critical to fielding a real railgun weapon is developing a robust guidance package that will allow the railgun to fire at distant targets or to hit incoming missiles. Developing such a package is a real challenge. The U.S. Navy's RFP Navy SBIR 2012.1 – Topic N121-102
  4.  for developing such a package gives a good overview of just how challenging railgun projectile guidance is:
The package must fit within the mass (< 2 kg), diameter (< 40 mm outer diameter), and volume (200 cm3) constraints of the projectile and do so without altering the center of gravity. It should also be able to survive accelerations of at least 20,000 g (threshold) / 40,000 g (objective) in all axes, high electromagnetic fields (E > 5,000 V/m, B > 2 T), and surface temperatures of > 800 deg C. The package should be able to operate in the presence of any plasma that may form in the bore or at the muzzle exit and must also be radiation hardened due to exo-atmospheric flight. Total power consumption must be less than 8 watts (threshold)/5 watts (objective) and the battery life must be at least 5 minutes (from initial launch) to enable operation during the entire engagement. In order to be affordable, the production cost per projectile must be as low as possible, with a goal of less than $1,000 per unit.
On June 22, 2015, General Atomics’ Electromagnetic Systems announced that projectiles with on-board electronics survived the whole railgun launch environment and performed their intended functions in four consecutive tests on June 9 and 10 June at the U.S. Army's Dugway Proving Ground in Utah. The on-board electronics successfully measured in-bore accelerations and projectile dynamics, for several kilometers downrange, with the integral data link continuing to operate after the projectiles impacted the desert floor, which is essential for precision guidance.

Trigger for inertial confinement fusion

Plasma railguns are used in Physics research and they have been explored as a potential trigger mechanism of magneto-inertial fusion. However, plasma railguns are very different from solid mass drivers or weapons, and they only share the basic operational concept.

Peasant

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Peasant Young women offer berries to visitors to their izba home...