CASEY, Thomas Lincoln, soldier, born in Madison Barracks, Sackett's Harbor, New York, 10 May, 1831. He is the son of General Silas Casey (vol. i., p. 550), and was graduated at the United States military academy as brevetted lieutenant of engineers in 1852. In 1854-'9 he was assistant professor of engineering at the military academy. From 1859 till 186l he had command of the engineer troops on the Pacific coast. During the civil war he served at first as staff engineer at Fort Monroe, Virginia, became captain in the engineer corps on 6 August, 1861, was superintending engineer of the permanent defences and field fortifications upon the coast of Maine, and served on special duty with the North Atlantic squadron during the first expedition to Fort Fisher, North Carolina, 8-29 December, 1864. He was made major on 2 October, 1863, and brevetted lieutenant-colonel and colonel on 13 March, 1865. In 1877 he was placed in charge of the public buildings and grounds in the District of Columbia, the Washington aqueduct, and the construction of the building for the state, war, and navy departments, which was completed on 31 May, 1888. He was engineer of the Washington monument from 1878 till its completion in 1884, and on 1 November, 1886, he became president of the board of engineers, in New York city. On 6 July, 1888, he was appointed brigadier-general, and chief of engineers, United States army, and on 2 October, 1888, he was, by act of congress, placed in charge of the erection of the building for the Library of congress. Besides numerous official reports, and articles upon engineering, he has contributed sketches to historical and genealogical magazines.