QF 13-pounder Mk IV AA gun

QF 13 pounder Mk IV anti-aircraft gun
A posed photo from early in World War I, showing gunners setting fuzes
TypeAnti-aircraft gun
Place of originUnited Kingdom
Service history
In service1915–1918
Used byBritish Empire
WarsWorld War I
Production history
DesignerElswick Ordnance Company
ManufacturerElswick Ordnance Company
Produced1914
No. built6
Specifications
Barrel lengthBore: 5 feet 6 inches (1.68 m);
Total: 5 feet 10 inches (1.78 m)[1]
Shell12.5 pounds (5.67 kg) Shrapnel; later HE
Calibre3-inch (76.2 mm)
BreechNordenfelt eccentric screw
RecoilHydro-spring
Carriagehigh-angle mounting on lorry
Elevation0° - 85°[1]
Traverse360°
Muzzle velocity1,600 ft/s (490 m/s) approx.[1]

The Ordnance QF 13-pounder Mk IV anti-aircraft gun was an Elswick Ordnance commercial 3 inch 13-pounder gun of which 6 were supplied during World War I. The Ordance QF 13-pounder MK IV is unrelated to the other British Mks 13-pounder.

History

Gunner of 99th Anti-aircraft Section at Salonika, with gun mounted on a Thornycroft lorry.

Elswick Ordnance had already developed the gun as a commercial venture and supplied the existing 6 guns to the British government in 1915 when the need for anti-aircraft guns became urgent.[2] All 6 were eventually sent to the Western Front and then various other theaters. Precise theaters of service are difficult to ascertain due to writers often not differentiating between various Mks of 13-pounder guns. 2 guns are known to have been operated by 99th Anti-Aircraft Section at Salonika from July 1917 until the end of the war.[3]

It is visibly identified by having 2 recoil/recuperator cylinders above the barrel. The cylinder immediately above the barrel is slightly shorter than the barrel, and the top cylinder is slightly longer than the barrel. The overall appearance is of a standard 13-pounder with an additional, slightly longer, recuperator cylinder on top. The gun breech also differed from standard British practice, in that it used a Nordenfelt breech similar to that of the French 75, but inverted : the breech was opened and closed by rotating it about an axis near the top of the barrel, which uncovered and covered the slot for entering the cartridge, rather than unscrewing and swinging it out as with the typical British Welin or Asbury breech.

Notes

  1. ^ a b c Hogg & Thurston 1972, page 63
  2. ^ Hogg & Thurston 1972, page 62
  3. ^ War Diary of 99th AA Section, 7 January 1918 refers explicitly to 13 pdr 6 cwt Mark IV guns. National Archives, Kew, UK

See also

References

Surviving examples

Wikimedia Commons has media related to QF 13 pounder Mk IV.

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