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BL 12 inch naval gun Mk I – VII
The BL 12 inch naval gun Mk I was a British rifled breech-loading naval gun of the early 1880s intended for the largest warships such as battleships and also coastal defence. It was Britain's first attempt to match the large guns being installed in rival European navies, particularly France, after Britain transitioned from rifled muzzle-loading guns to the modern rifled breech-loaders somewhat later than the European powers. Mks I - VII〔Mk I = Mark 1, Mk VII = Mark 7. Britain used Roman numerals to designate marks (i.e. models) of ordnance until after World War II. Hence this article describes the first seven models of British BL 12-inch guns〕 all had a barrel of approximately 303 inches in length (25.25 calibres) and similar performance.
==Naval service==
Mk II was installed on battleships from 1882, and the coastal service ironclad . Mk II guns failed in service and were quickly replaced by Mks III. IV and V, with many changes and improvements. The later marks were also mounted on , sistership of ''Conqueror'', and on
, sister ship of ''Colossus''.
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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