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USS Alligator (1862)
The USS ''Alligator'', the fourth United States Navy ship of that name, is the first known U.S. Navy submarine, and was active during the American Civil War. The first American submarine, built in the Revolutionary War era, was the ''Turtle''; however, the modern U.S. Navy did not yet exist when this craft was operational.
==Construction==
In the autumn of 1861, the Navy asked the firm of Neafie & Levy to construct a small submersible ship designed by the French engineer Brutus de Villeroi, who also acted as a supervisor during the first phase of the construction.
The ship was about 30 ft (9 m) long and 6 ft (1.8 m) or 8 ft (2.4 m) in diameter. "It was made of iron, with the upper part pierced for small circular plates of glass, for light, and in it were several water tight compartments." For propulsion, she was equipped with sixteen hand-powered paddles protruding from the sides, but on 3 July 1862, the Washington Navy Yard had the paddles replaced by a hand-cranked propeller, which improved its speed to about four knots. Air was to be supplied from the surface by two tubes with floats, connected to an air pump inside the submarine.
The Navy wanted such a vessel to counter the threat posed to its wooden-hulled blockaders by the former screw frigate ''Merrimack'' which, according to intelligence reports, the Norfolk Navy Yard was rebuilding as an ironclad ram for the Confederacy (the CSS ''Virginia''). The Navy's agreement with the Philadelphia shipbuilder specified that the submarine was to be finished in not more than 40 days; its keel was laid down almost immediately following the signing on 1 November 1861 of the contract for her construction. Nevertheless, the work proceeded so slowly that more than 180 days had elapsed when the novel craft finally was launched on 1 May 1862.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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