Armored torpedo vessel. Ram bow, round stern, twin screws, partial sail-power. The armored belt, made up of five inches of laminated plating, encircles the water-line to the height of the upper-deck beams. The lower part of the smoke-stack is protected by a belt of nine inches of laminated plating. The deck is made up of two ¾-inch thicknesses of plate covered by a wooden deck. The pilot-house forward is musket-proof. The hull is of iron, with a wood backing to the armor of eleven inches. Aft is a light wooden superstructure, forming quarters for officers. The vessel carries no guns and is provided with torpedo-spars (one forward and four broadside). [Illustration: INTREPID.] ALARM. Partially armored torpedo gun-boat. Ram bow, pointed stern. Mallory steering-screw; no sail-power. The bow of the vessel is provided with an armored traverse of four inches thickness, the remainder of the hull being unprotected. One 15-inch smooth-bore is carried forward, firing only straight ahead. It is the intention to replace this by a 10-inch rifle. The hull is of iron and double, with cellular compartments and water-tight compartments in addition. Three torpedo-spars are projected. One from the snout of the ram a distance of 30 feet, and one from each beam 17 feet. Musket-proof pilot-house aft. Steel ⅜-inch deck-plate under a wooden deck. [Illustration: ALARM.] UNITED STATES GENERAL-SERVICE FLEET. A = Length between Perpendiculars. B = Breadth of Beam. C = Maximum Draft. D = Displacement. E = Indicated Horse-power. F = Maximum Speed. G = Date of Launch. ----------------+-----+----+-----+-------+-------+-----+-------- TYPE AND NAME. | A | B | C | D | E | F | G ----------------+-----+----+-----+-------+-------+-----+-------- | Ft. | Ft.| Ft. | Tons. | |Knots| Year Frigates. Colorado | 264 | 53 | 23¼ | 4,772 | 997 | 9 | 1855 Franklin | 270 | 54 | 25½ | 5,162 | 2,000 | 10 | 1865 Minnesota | 265 | 51 | 24 | 4,833 | 993 | 9 | 1855 Wabash | 262 | 51 | 23½ | 4,774 | 1,039 | 10 | 1855 Tennessee | 335 | 45 | 22½ | 4,105 | 2,500 | 10 | 1865 ----------------+-----+----+-----+-------+-------+-----+-------- Corvettes. Lancaster | 236 | 46 | 19 | 3,291 | 2,000 | 9 | 1858 Brooklyn | 233 | 43 | 19 | 2,686 | 705 | 9 | 1858 Pensacola | 231 | 45 | 20 | 2,852 | 2,000 | 10 | 1858 Hartford | 225 | 44 | 18 | 2,826 | 696 | 8 | 1858 Richmond | 225 | 43 | 17 | 2,604 | 2,000 | 9 | 1858 Trenton | 253 | 48 | 21¾ | 3,900 | 3,500 | 13 | 1876 Powhatan | | | 18¾ | 3,980 | 1,500 | 10 | 1850 Alaska | 251 | 38 | 17½ | 2,394 | 1,150 | 12½ | 1868 Benicia | 251 | 38 | 17½ | 2,394 | 1,150 | 9 | 1868 Omaha | 251 | 38 | 17½ | 2,394 | 1,150 | 12½ | 1868