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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク BL 12 inch Mk X naval gun ： ウィキペディア英語版 BL 12 inch Mk X naval gun The BL 12 inch Gun Mark X〔Mark X = Mark 10. Succeeding versions were Mark XI (11) and XII (12). Britain used Roman numerals to denote Marks (models) of ordnance until after World War II〕 was a British 45-calibres naval gun which was mounted as primary armament on battleships and battlecruisers from 1906. It first appeared on . ==History== Mk X continued the trend of lengthening gun barrels as far as new construction methods would permit, in order to allow more cordite propellant to be used to attain higher projectile velocities. Mk X increased the bore length from Mk IX's 480 inches (40 calibres) to 540 inches (45 calibres), increasing muzzle velocity from 2,600 to 2,700 feet/second. Subsequent British attempts to further increase the power of 12-inch guns led to failure with the 50-calibre Mk XI and Mk XII guns; the Mk X was the last successful 12-inch British gun. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BL 12 inch Mk X naval gun」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.