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HMS Royal Sovereign (1857)
HMS ''Royal Sovereign'' was originally laid down as a 121-gun first-rate ship of the line of the Royal Navy. She would have mounted sixteen cannon, 114 guns, and a pivot gun. With the rise of steam and screw propulsion, she was ordered to be converted on the stocks to a 131-gun screw ship, with conversion beginning on 25 January 1855. She was finally launched directly into the ordinary on 25 April 1857. She measured burthen, with a gundeck of and breadth of , and a crew of 1,100, with engines of 780 nhp.
==Turret ship==
After several years of inactivity, she was selected for conversion into an experimental turret ship instigated by Captain Cowper Coles, who believed that a mastless ship armed with turret-mounted guns was the best possible design for a coast-defence ship. When this conversion was completed 20 August 1864, she was the first British turret-armed ship, and the only one with a wooden hull. The order to proceed with the conversion was issued on 4 April 1862.
She was razed down to the lower deck, leaving her with between of freeboard. The decks and hull sides were strengthened to carry the planned armament, and to absorb the force when the guns were fired. There was some delay when it was found that she had been cut down too far, necessitating some re-building of the sides. On completion her length-to-beam ratio was slightly under 4:1, which was the smallest ever ratio used in British armoured ships.
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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