 "Isaac N. Seymour" was a wooden-hulled sidewheel steamer built by Benjamin C. Terry at Keyport, New Jersey, in 1860 as the tugboat "I. N. Seymour".The ship had a displacement of 133 long tons, a length of 100 feet, beam of 19 feet 8 inches and hold depth of 7 feet 6 inches; her draft fully loaded was 6 feet 6 inches, with a light draft of 5 feet 6 inches."I.