Robert Parker Parrott, an American inventor, born in Lee, N. H., Oct. 5, 1804. He graduated at the United States military academy in 1824, became second lieutenant of artillery, and served at the academy from 1824 to 1829 as assistant professor of mathematics, and as principal assistant professor of natural and experimental philosophy. He afterward served with his regiment at Fort Constitution and Fort Independence. He was detailed for ordnance duty in 1834, took part as a staff officer in the war against the Creeks, and was appointed captain in the ordnance corps in 1836, from which he resigned shortly afterward to become superintendent of the West Point iron and cannon foundery, situated at Cold Spring, Putnam county, N. Y. He served as first judge of the court of common pleas for that county from 1844 to 1847. While in charge of the West Point foundery he invented and perfected the Parrott system of rifled guns and projectiles, which were first introduced into actual use at the battle of Bull Run, July 21, 1861; they were extensively used by the national army and navy till the end of the civil war. (See Artillery, vol. i., p. 796.) One 30-pdr. gun of this system, mounted at Cumming's point, was used against Charleston, and withstood the extraordinary test of being fired 4,606 times before bursting.