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Dress: Pink Material:100% polyester For age 3-12 girls We fancy yard costumes was founded in 1990..And you can see more from tn bape hats mens ralph lauren tiffany jewlery earing want dg sunglasses whloesale okely sunglasses low testosterone women holiday inn express women wedding crown pet fashion belt QF 2 pdr Mark VIII ("pom-pom")The quadruple 2 pdr mounting (Mk.VII) of HMS KelvinTypeautocannonPlaceoforiginUnited KingdomService historyInservice19151940s (Mk II)19301940s (Mk VIII)UsedbyBritish EmpireJapanRussiaItalyWarsWorld War IWorld War IIProduction historyDesignerVickers ArmstrongsDesigned1915 (Mk II)1923 (Mk VIII)VariantsLow Velocity (LV) & High Velocity (HV),RHI, LHI, RHO, LHO for multiple mountings,Type 91 HI Shiki (Japanese)Specifications (Mk.VIII HV)Weight850 lb (385.5 kg)Length102.6 in (2.61 m)Shell40 158RCalibre40 mm (1.575 in)Barrels1, 4 or 8Rateoffire115 rpmMuzzlevelocity701 m/s (2,300 ft/s)Effectiverange3,960 m A/A ceiling (13,300 ft)Maximumrange4,572 m (5,000 yards)Feedsystem14-round steel-link beltFillingweight71 g (2.5 oz)The 2-pounder gun, officially designated the QF 2-pounder (QF denoting "quick firing") and universally known as the pom-pom, was a 1.575 inch (40 mm) British autocannon, used famously as an anti-aircraft gun by the Royal Navy. The name came from the sound that the original models were reported to make when firing. Although these were 2-pounder guns, in that they fired a projectile with a weight of 2 pounds, they were not the same gun as that used by the British Army as an anti-tank weapon or to equip British tanks and certain armoured cars.Contents1 Predecessors - Boer War and the Great War 1.1 QF 1 pounder 1.2 QF 1? pounder 2 QF 2-pounder Mark II 3 QF 2-pounder Mark VIII 4 QF 2-pounder Mark XIV 5 See also 6 References 7 External links // Predecessors - Boer War and the Great WarQF 1 pounderMain article: QF 1 pounder pom-pomThe first gun to be called a pom-pom was the 37 mm Nordenfelt-Maxim or "QF 1-pounder" introduced during the Second Boer War, the smallest artillery piece of that war. It fired a shell one pound in weight accurately over a distance of 3,000yards (3,000m). The barrel was water cooled and the shells were belt-fed from a 25 round fabric belt. The Boers used them against the British, who, seeing their utility, had the design copied by Vickers, who were already producing Maxim guns.In World War I it was used in the trenches of the Western Front against aircraft. It was common British practice at this time to refer to artillery by the weight of the projectile rather than the bore of the barrel, e.g. a 3-pounder gun had a calibre of 47 mm, a 6-pounder was 57 mm etc.QF 1? pounderThe first naval pom-pom was the QF 1.5-pdr Mark I, a piece with a calibre of 37mm (1.46in) and a barrel 43 calibres long. This was trialed in the Arethusa class light cruisers HMS Arethusa and HMS Undaunted, but did not enter full service, being replaced instead by a larger weapon, the QF 2-pdr Mark II (see below).QF 2-pounder Mark IIMk II guarding a train against air attack, Mesopotamia, 1918The QF 2-pounder Mark II was essentially a scaled-up version of the QF 1 pounder Maxim gun produced by Vickers. It was a 40 mm calibre gun with a water-cooled barrel and a Vickers-Maxim mechanism. It was ordered in 1915 by the Royal Navy as an anti-aircraft weapon for ships of cruiser size and below. The original models fired from hand-loaded fabric belts, although these were later replaced by steel-link belts. This 'scaling-up' process was not entirely successful, as it left the mechanism rather light and prone to faults such as rounds falling out of the belts.Surviving weapons were brought out of storage to see service in World War II, mainly on board second-rate ships such as naval trawlers, Motor Boats and "armed yachts". It was used almost exclusively in the single barrel, unpowered pedestal mountings P Mark II (Royal Navy nomenclature confusingly gave mountings and guns their own distinct Mark numbers) except for a small number of weapons on the mounting Mark XV which was a twin-barreled, powered mount. These were overweight and cumbersome and too heavy to be of any use at sea and were therefore mounted ashore. All were scrapped by 1944.Calibre: 40 mm L/39 Total length: 96 inches.[1] Length of bore: 62 inches[1] Rifling: Polygroove, plain section, 54.84 inches, uniform twist 1 in 30 inch, 12 grooves.[1] Weight of gun & breech assembly: 527 lb[1] Shell Weight: 2 lb (980 g). HE. Rate of Fire: 200 rpm Effective Range: 1,200 yd (1,000 m) Muzzle Velocity: 1920 ft/s (585 m/s) Some 7,000 guns were made. The gun was also used by the Japanese as the 40 mm/62 "HI" Shiki.For more extensive technical data see 2-pdr Mark II at Navweaps.comQF...(and so on)


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