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The RML 64 pounder 64 cwt gun was a Rifled, Muzzle Loading (RML) naval, field or fortification artillery gun manufactured in England in the 19th century, which fired a projectile weighing approximately . "64 cwt" refers to the gun's weight rounded up to differentiate it from other "64-pounder" guns. ==Description== The calibre of 6.3 inches was chosen to enable it to fire remaining stocks of spherical shells originally made for the obsolete 32 pounder guns if necessary. Mark I (adopted in 1864) and Mark II (adopted 1866) guns, and Mark III guns made from 1867 - April 1871 had wrought-iron inner "A" tubes surrounded by wrought-iron coils. Mark III guns made after April 1871 were built with toughened mild steel "A" tubes, and earlier Mark III guns were re-tubed with steel and were classified as a siege gun in land service. Remaining guns with iron tubes were used for sea service.〔Treatise on Construction and Manufacture of Service Ordnance, 1879, pages 292, 261-265〕 Rifling of all guns consisted of 3 grooves, with a uniform twist of 1 turn in 40 calibres (i.e. 1 turn in 252 inches).〔 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 64 pounder 64 cwt gun」の詳細全文を読む スポンサード リンク
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