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RML 40 pounder gun
The RML 40-pounder gun was a British rifled muzzle-loading siege and fortification gun designed in 1871. It was intended to supersede the RBL 40 pounder Armstrong gun〔Treatise on the Construction and Manufacture of Ordnance in the British Service, 1877, Page 260.〕 after the British military reverted to rifled muzzle-loading artillery until a more satisfactory breech-loading system than that of the Armstrong guns was developed.
==Description==
The original Mk I short barrel of 18 calibres suffered from irregular velocity and hence accuracy, due to incomplete burning of the powder charge, hence only 20 were built.
Mk II of 1874 with barrel lengthened to 22 calibres solved this problem and became the definitive model.〔Treatise on the Construction and Manufacture of Ordnance in the British Service, 1877, Page 260.〕
The gun consisted of a central toughened steel "A" tube surrounded by wrought-iron coils, with a trunnion ring and cascabel. Rifling was the "Woolwich" pattern of three broad grooves, with a uniform twist of 1 turn in 35 calibres (i.e. in 166.25 inches).〔Text Book of Gunnery 1887, Table XVI, Page 312.〕
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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