The third-class torpedo boats (length 61 feet 8 inches, beam 9 feet 1 inch; displacement 14 and three quarter tons) built for the United States Navy's battleship Maine were fitted with inverted-vertical direct-acting quadruple-expansion surface-condensing marine engines, with steam being supplied at 250 pounds per square inch by marine water-tube boilers. Whilst, the third-class torpedo boats (length 50 feet, beam 9 feet 1 inch; displacement 12 and a half tons) built for use on the Texas were fitted with inverted-vertical direct-acting quadruple-expansion surface-condensing marine engines, with steam being supplied at 250 pounds per square inch by marine water-tube boilers. Mr. G. W. Melville, of the United States Naval Marine Engineering Department of Washington, designed the engines in both classes.