About the middle of the 18th century, French gunsmith Honoré Blanc developed the concept of interchangeable parts for muskets. Blanc tried to interest other European gunsmiths, but they were not impressed by the idea. But he did interest the American Ambassador to France, Thomas Jefferson. Jefferson quickly saw that mass production of weapons parts would free America from dependence on European sources for parts. He could not get Blanc to move to the United States but he did convince President George Washington it was a good idea. In 1798, Eli Whitney got the first contract for 10,000 muskets to be delivered within two years. Whitney used a large force of unskilled workers and machinery to produce standardized identical parts at a low cost. Congress had already decided to pattern the new musket after the 1763 French Charleville model. Whitney, like other contractors, had been given 2 or 3 to work with.