ISAAC ROBERDEAU - (1773-1829) - Army Engineer, born in Philadelphia, Pa. Educated partly here and partly in England, was assistant engineer engaged in laying out Wasington, D.C. at request of General Washington (1891). Then built canals and (1813) made major and topographical engineer in the U.S. Regular army during War of 1812, this corps being then just constituted by appointment of four majors and four captains. At close of war, was ordered to survey boundary line between of the U.S. and Canada, under Treaty of Ghent. Was in charge of this survey of nearly 900 miles of length. In 1818, organized the bureau of topographical engneers in War Department and was in charge until his death as Colonel.