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The RML 10 inch guns Mk I - Mk II were large rifled muzzle-loading guns designed for British battleships and monitors in the 1860s to 1880s. They were also fitted to the ''Bouncer''-class flat-iron gunboats. ==Design== The 10-inch gun was a standard "Woolwich" design (characterised by having a steel A tube with relatively few broad, rounded and shallow rifling grooves) developed in 1868, based on the successful Mk III 9-inch gun, itself based on the "Fraser" system. The Fraser system was an economy measure applied to the successful Armstrong design for heavy muzzle-loaders, which were expensive to produce. It retained the Armstrong steel barrel surrounded by wrought-iron coils under tension, but replaced the multiple thin wrought-iron coils shrunk around it by a single larger coil (10 inch Mark I) or 2 coils (Mark II); the trunnion ring was now welded to other coils; and it eliminated Armstrong's expensive forged breech-piece.〔Treatise on Construction of Service Ordnance 1877, page 92-93〕 The gun was rifled with 7 grooves, increasing from 1 turn in 100 calibres to 1 in 40.〔 It was first used for the main armament on the central battery ironclad HMS ''Hercules'', completed in late 1868. A number of the Mk I guns on HMS ''Hercules'' and one of the two damaged guns in HMVS ''Cerberus'' suffered from cracked barrels.〔( HMVS Cerberus website. reports of cracked guns )〕 Presumably this is why only a few (at least 25) Mk I guns were made. 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「RML 10 inch 18 ton gun」の詳細全文を読む スポンサード リンク
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