QF 13-pounder 6 cwt AA gun
The Ordnance QF 13 pounder Mk III anti-aircraft gun, also known as 13 pounder 6 cwt, was an early British improvisation in World War I to adapt the QF 13-pounder field gun to anti-aircraft use.[i] This was a standard QF 13 pounder field gun barrel and breech with the addition of a retaining catch to the breech to retain the round when loading at high angles.[3] Hence the appearance was of a gun barrel with 2 slightly shorter tubes of similar diameter above it.[3] On the Mk II mount the gun has the appearance of a standard 13 pounder.The gun's performance was "ballistically poor" and it was only marginally effective against aircraft.
Thornycroft J TypeArmentièresAnti-aircraft gunBritish EmpireBarrelShrapnelCalibreRecoilElevationTraverseQF 13-pounder field gunanti-aircraftQF 13 poundergunlayers13 pounder 9 cwt3 inch 20 cwtEgypt and PalestineMesopotamiaSalonika frontWestern FrontQF 13-pounder 9 cwtQF 12-pdr 12 cwtQF 3-inch 20 cwtQF 3 inch 20 cwtQF 4-inch Mk VList of anti-aircraft gunsHogg, I.V.Ian AllanartilleryFirst World WarArmoured vehicleQF 3-pounder VickersQF 6-pounder HotchkissQF 6-pounder 6 cwtInfantry guns1.59-inch breech-loading Vickers Q.F. gun, Mk IIField artilleryBL 12-pounder 6 cwtQF 12-pounder 8 cwtQF 13-pounderBL 15-pounderBLC 15-pounderQF 15-pounderQF 18-pounderQF 4.5-inch howitzerheavy artilleryQF 4.7-inch gunBL 5-inch howitzerBL 5.4-inch howitzerBL 60-pounder gunBL 6-inch gun Mk VIIBL 6-inch gun Mk XIXBL 6-inch 26 cwt howitzerBL 6-inch 30 cwt howitzerBL 8-inch howitzer Mk I – VBL 8-inch howitzer Mk VI – VIIIBL 7.5-inch Mk III naval gunBL 9.2-inch howitzerBL 9.2-inch Mk X naval gunBL 12-inch howitzerBL 12-inch Mk X naval gunBL 15-inch howitzerMountain artilleryRML 2.5-inch mountain gunBL 10-pounder mountain gunBL 2.75-inch mountain gunQF 2.95-inch mountain gunQF 3.7-inch mountain howitzerMortarsGarland trench mortar3-inch Stokes mortarVickers 1.57-inch mortar2-inch medium mortarNewton 6-inch mortar9.45-inch Heavy MortarLivens ProjectorLivens Large Gallery Flame ProjectorAnti-aircraft gunsQF 1-pounder pom-pomQF 2-pounder "pom-pom" Mk IIQF 12-pounder 12 cwtQF 13-pounder Mk IVCoastal artilleryQF 4-inch naval gun Mk I – IIIBL 6-inch Mk VII naval gunBL 9.2-inch Mk IX – X naval gunRailway gunsBL 9.2-inch railway gunBL 12-inch railway gunBL 12-inch railway howitzerBL 14-inch railway gun