Mahan, Dennis Hart
engineer, author, was born April 2, 1802, in New York city. He was a military engineer of distinction, whose text books have been widely used. He was the author of Treatise on Field Fortifications; Elementary Course of Civil Engineering; Elementary Treatise on Advanced Guard, etc.; Industrial Drawing; Descriptive Geometry; Philosophy of Engineering; Permanent Fortifications; and an edition of Moseley's Mechanical Principles of Engineering and Architecture, with additions. He died Sept. 16, 1871, in Stony Point, N. Y.
MAHAN, FREDERICK AUGUSTUS, military engineer, author, was born March 28, 1847, in West Point, N. Y. He is a noted military engineer; and one of the foremost authorities on military subjects in America.