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RML 6.3-inch howitzer : ウィキペディア英語版 | RML 6.3-inch howitzer
The RML 6.3-inch howitzer was a British rifled muzzle-loading "siege" or "position" howitzer/mortar proposed in 1874 and finally introduced in 1878 as a lighter version of the successful 8-inch howitzer that could be carried by the existing 40-pounder gun carriage.〔Treatise on Construction of Ordnance in the British Service, 1879, pages 79; 171; 259-260〕 By 1880 the RML 6.3-inch was superseded by a longer 6.6-inch howitzer with higher muzzle velocity.〔(【引用サイトリンク】title=The Gun - Rifled Ordnance: Howitzers )〕 ==Description==
The barrel consisted of an inner "A" tube of toughened mild steel, surrounded by wrought-iron "B" tube and jacket. Rifling was of the "polygroove" type, with 20 grooves and a twist increasing from 1 turn in 100 calibres (i.e. 630 inches) to 1 in 35 (i.e. 220 inches).〔
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