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The Ordnance QF 18-pounder, [note 3] or simply 18-pounder gun, was the standard British Empire field gun of the First World War-era. It formed the backbone of the Royal Field Artillery during the war, and was produced in large numbers.
Light field gun 76.2 mm 3 inch Ordnance QF 13-pounder: Light field gun 76.2 mm 3 inch 15- pounder (multiple types) Field gun 76.2 mm 3 inch Ordnance QF 17- pounder: Anti-tank gun 76.2 mm 3 inch Ordnance QF 18- pounder: Field gun 83.8 mm 3.3 inch Ordnance QF 20-pounder: Tank gun 83.8 mm 3.3 inch Ordnance QF 25-pounder: Gun-howitzer 87.6 mm 3.45 ...
The 75 mm gun model of 1917 was an interim measure, based on the British QF 18-pounder, produced by the United States in World War I after it had decided to switch from 3-inch (76 mm) to 75 mm calibre for its field guns.
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.
The Mark I was a 25-pounder barrel and breech in the modified jacket of an 18-pounder gun, as a 'loose liner'. The jacket provided the interface to the 18-pounder carriage. The earliest versions retained 18-pounder type elevation sights but later ones had Probert pattern calibrating sights on the right side of the saddle.
In lighter QF guns, including field guns and anti-aircraft guns, the round was complete: "fixed ammunition", where the shell was attached to the cartridge case like a large bullet. Examples are the QF 3-pounder Vickers, QF 18-pounder field gun, QF 4-inch Mk V anti-aircraft gun and the current 4.5-inch Mark 8 naval gun. Fixed QF was suited for ...
Royal Navy deck mounting of the QF 3-pounder Hotchkiss, the first modern QF gun, 1915. The French firm Hotchkiss produced the QF 3 pounder as a light 47 mm naval gun from 1886. The gun was ideal for defending against small fast vessels such as torpedo boats and was immediately adopted by the RN as the "Ordnance QF 3 pounder Hotchkiss". [2]
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.