QF 3 inch 20 cwt gun

The QF 3-inch 20 cwt anti-aircraft gun became the standard anti-aircraft gun used in the home defence of the United Kingdom against German Zeppelins airships and bombers and on the Western Front in World War I. It was also common on British warships in World War I and submarines in World War II. 20 cwt referred to the weight of the barrel and breech, to differentiate it from other 3-inch guns. While other AA guns also had a bore of 3 inches (76 mm), the term 3-inch was only ever used to identify this gun in the World War I era, and hence this is what writers are usually referring to by 3-inch AA gun.

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1914  Wikimedia, Wikidata
Ordnance QF 3in 20cwt; QF 3 inch 20 cwt anti-aircraft gun
anti-aircraft gun, Vickers, British Army, 

Almirante Latorre, HMS Delhi, HMS Iron Duke, HMS Renown, HMS Shakespeare, HMS Tiger, 

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Location: KML, Cluster Map, Maps,

Frameless

RN gunner with fixed round WWII IWM TR 1447

3-inch AA gun and crew on HMS Royal Oak WWI IWM Q 18496

No84FuzeMkIC

Sinai (997009157578605171

The officers of HM Submarine SERAPH on her return to Portsmouth, 24 December 1943.

Sinai (997009157578505171

3-inch AA gun and crew on HMS Royal Oak WWI IWM Q 18495

No80-44TimeFuze

Anti-aircraft Gun Art.IWMART1288

3inch20cwtAAgunPeerlessLorryWWI

Type	Subtype	Date	Description	Notes	Source
commons	image		RN gunner with fixed round WWII IWM TR 1447		Commons
commons	image		3-inch AA gun and crew on HMS Royal Oak WWI IWM Q 18496		Commons
commons	image		No84FuzeMkIC		Commons
commons	image		Sinai (997009157578605171		Commons
commons	image		The officers of HM Submarine SERAPH on her return to Portsmouth, 24 December 1943.		Commons
commons	image		Sinai (997009157578505171		Commons
commons	image		3-inch AA gun and crew on HMS Royal Oak WWI IWM Q 18495		Commons
commons	image		No80-44TimeFuze		Commons
commons	image		Anti-aircraft Gun Art.IWMART1288		Commons
commons	image		3inch20cwtAAgunPeerlessLorryWWI		Commons