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BL 13.5-inch Mk V naval gun
The BL 13.5 inch Mk V gun〔Mk V = Mark 5. Britain used Roman numerals to identify Marks (models) of ordnance until after World War II. This was the fifth model of British 13.5 inch gun〕 was a British heavy naval gun, introduced in 1912 as the main armament for the new super-dreadnought battleships of the . The calibre was 13.5 inches (343 mm) and the barrels were 45 calibres long i.e. 607.5 inches (15.43 m). The guns were greatly superior to the earlier 13.5-inch (30-calibre) Mk I to Mk IV guns used on the , and es completed between 1888 and 1896.
==Characteristics==
The gun weighed approximately 168,000 lb (76 tonnes) (excluding the breech), and in its original form fired a 1,250 lb (567 kg) armour-piercing capped (APC) or high-explosive (HE) round a distance of 23,800 yards (21,800 m) at a 20-degree elevation.〔(navweaps.com - 13.5-in/45 Mark V )〕
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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