The QF 4-inch gun Mks I, II, III were early British QF naval guns originating in 1895. They all had barrels of 40 calibres length.
Australian troops with gun on a transport ship, circa. November 1914
The 4-inch QF gun on Hirta looking towards Dùn
The three Invincible-class battlecruisers were built for the Royal Navy and entered service in 1908 as the world's first battlecruisers. They were the brainchild of Admiral Sir John Fisher, the man wh
QF 4-inch naval gun Mk I – III
…Topaze-class third-class cruisers, launched in 1903 Invincible-class battlecruisers of 1906 Its 25-pound (11 kg) shell proved insufficiently powerful to make it much of an improvement on the 12-pounder. From 1907 onwards…
An early photograph of Invincible, before her torpedo nets were removed
The guns of 'P' and 'Q' turrets trained across the deck
4-inch guns seen mounted on roof of Inflexible's Q turret, 1909
Invincible during the pursuit of the German cruiser squadron