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The BL 18-inch Mk I naval gun was a breech-loading naval rifle used by the Royal Navy during World War I.It was the largest and heaviest gun ever used by the British. [1] Only the Second-World-War Japanese 46 cm/45 Type 94 had a larger calibre, 18.1 inches (46 cm), but it fired a lighter shell.
The 18-pounder long gun was an intermediary calibre piece of naval artillery mounted on warships of the Age of Sail. They were used as main guns on the most typical frigates of the early 19th century, on the second deck of third-rate ships of the line , and even on the third deck of late first-rate ships of the line.
BL 16.25-inch Mk I naval gun; BL 18-inch Mk I naval gun; Bofors 40 Mk4; ... Gas-checks in British RML heavy guns; Gyro rate unit; H. Hazemeyer gun mount; M. ML 8-inch ...
BL 6 inch Mk XII naval gun 45-caliber United Kingdom: World War I - World War II 152.4 mm (6.00 in) BL 6 inch naval guns Mk XIII – XVIII United Kingdom: World War I - World War II 152.4 mm (6.00 in) BL 6 inch Mk XXII naval gun 50-caliber United Kingdom: 1920s - World War II 152.4 mm (6.00 in) BL 6 inch Mk XXIII naval gun 50-caliber
The last of these, HMS Furious, was intended to carry only two 18-inch guns, one forward and one aft, far larger and more powerful than the 15-inch weapons that were standard on the Queen Elizabeth and Revenge-class battleships, and the two Renown-class battlecruisers; at the same time her deck and belt armour was at best only 3 inches thick ...
The 18"/48 caliber Mark 1 – United States Naval Gun was the initial name and design for a large caliber naval gun in the early 1920s. After the Washington Naval Treaty prohibited the development of guns larger than 16 in (406 mm), the gun was relined and finished as a high velocity 16"/56 Mark 4 gun.
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The QF 12 pounder 18 cwt gun (Quick-Firing) was a 3-inch high-velocity naval gun used to equip larger British warships such as battleships for defence against torpedo boats. 18 cwt referred to the weight of gun and breech (18 × 112 lb = 2,016 lb or 914 kg), to differentiate the gun from others that also fired the "12 pound" (actually 12.5 lb or 5.7 kg) shell.