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The BL 13.5 inch Mk V gun [note 2] was a British heavy naval gun, introduced in 1912 as the main armament for the new super-dreadnought battleships of the Orion class.The calibre was 13.5 inches (343 mm) and the barrels were 45 calibres long at 607.5 inches (15.43 m).
The BL 13.5-inch Mk VI gun was a British heavy naval gun, originally ordered by the Ottoman Navy to equip its Reşadiye-class dreadnoughts around 1911. The one ship completed was seized by the British Government when World War I began in August 1914 and became HMS Erin.
The BL 13.5 inch naval gun Mk I ("67-ton gun") was Britain's first successful large breechloading naval gun, initially designed in the early 1880s and eventually deployed in the late 1880s. Mks I - IV [ note 1 ] were all of 30 calibres length and of similar construction and performance.
QF 14 pounder naval gun Mk I & II naval gun United Kingdom: World War I 76.2 mm (3.00 in) QF 3-inch 20 cwt Mk I, Mk II, Mk III, Mk IV United Kingdom: World War I - World War II 76.2 mm (3.00 in) 8 cm/40 3rd Year Type naval gun Japan: World War I - World War II 76.2 mm (3.00 in) 8 cm/60 Type 98 naval gun Japan: World War II 88 mm (3.5 in)
The BL 15-inch Mark I succeeded the BL 13.5-inch Mk V naval gun.It was the first British 15-inch (380 mm) gun design and the most widely used and longest lasting of any British designs, and arguably the most successful heavy gun ever developed by the Royal Navy. [3]
In the 1930s, the Mark 1, 2, 3, and 5 were upgraded to allow for increased charges and muzzle velocities, resulting in the Mark 8, 9, 10, and 12, respectively. All guns employed a Welin breech block and used a Smith- Asbury mechanism , and, in the case of the Mark 12, chromium plating was introduced to prolong barrel life.
The Mk XII derived from it suffered from the same problems. Instead of attempting to improve their 12-inch gun, the British developed the 13.5-inch Mk V gun of 45-calibres, which could achieve greater range at lower muzzle velocities due to its larger shell. Mk XI guns were mounted on: St. Vincent-class battleships laid down 1907, commissioned 1910
The Vickers Medium Mark II was a British medium tank built by Vickers during the interwar period of the First and Second World Wars. The Medium Mark II, derived from the Vickers Medium Mark I, was developed to replace the last of the Medium Mark Cs still in use. Production and rebuilding ran from 1925 until 1934.