A dual-purpose gun is a naval artillery mounting designed to engage both surface and air targets.
The Mark 37 Modification 6 5-inch dual-purpose gun on display at the National Museum of the Pacific War. The gun had a range of over 6 miles and could fire 22 rounds a minute.
King George V-class battleship (1939)
The King George V-class battleships were the most modern British battleships in commission during the Second World War. Five ships of this class were built: HMS King George V, HMS Prince of Wales (1941), HMS Duke of York (1941), HMS Anson (1942) and HMS Howe (1942). The names honoured King George V, and his sons, Edward VIII, who had been Prince of Wales, and George VI who was Duke of York before ascending to the throne; the final two ships of the class were named after prominent 18th century admirals of the Royal Navy.
HMS King George V in 1945
The external vertical armour belt is clearly visible here on Howe
Armour and underwater protection of King George V
Secondary battery 5.25-inch dual purpose turret of King George V