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QF 6 pounder 10 cwt gun
The British QF (quick-firing) 6 pounder 10 cwt gun〔"6 pounder" refers to approximate weight of projectiles, which was a traditional British way of denoting small guns. "10 cwt" referred to the approximate weight of the gun and breech in cwt (hundredweight) rounded up : 10 cwt = 10 x 112 pounds = 1,120 pounds. It was standard British practice to differentiate guns of the same calibre by adding weight in cwt to the description.〕 was a 57 mm twin-mount light coast defence and naval gun from the 1930s to 1950s.
==Development==
Following the emergence of small fast attack craft during World War I, it was decided that the British Royal Navy Dockyards were vulnerable to attack by motor torpedo boats which had the speed to evade the heavy coast defence guns which defended them. In 1925, a design was adopted for a twin barrelled weapon capable of sustained semi-automatic fire. Both barrels of the weapon could be fired singly or they could be combined. The pedestal mounting and the gun crew were enclosed to the front, sides and top in a reinforced-steel barbette.
The first trials took place in 1928 with production beginning at the Woolwich Ordnance Factory in 1933. Formal War Office acceptance occurred on 28 February 1934. A coastal-defence trial using the gun and barbette was conducted at Culver Battery on the Isle of Wight in 1936.〔(【引用サイトリンク】title=Fortifications of the Isle of Wight - Culver Battery )〕 As the shadow of Second World War approached, food equipment and machinery manufacturer, Baker Perkins, was asked to take over production in March 1939; the first guns left its Westwood, Peterborough factory in March 1941.
The Mark II version of the QF 6 pounder had a monobloc barrel (made from a single forging) instead of a lined barrel in the Mark Is.
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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