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Holland submarine torpedo-boat. John P. Holland devised a submarine boat which met with the requirements of the United States Navy Department. When submerged, the boat was propelled by electricity, and able to make 8 knots for six hours. Among the requirements were power to carry two tubes for automobile torpedoes; ability to reach a depth of 20 feet within one minute after being ordered to dive, the boat running light at full speed, and with smokepipe at full height; power to dive to a depth of 20 feet within thirty seconds, the boat before diving running at full speed with steam-power, and with 3 feet of water over hull, and smoke-pipe up; with complete submergence and 3 feet of water over turret, the pilot to obtain a view with a camera-lucida in a tube projecting above the surface; a turret to rise 4 feet above the hull, with an armor cylinder of 8 inches thickness to protect the pilot's head; a complete double shell to extend The Holland submarine torpedo-boat. about t