|BL 7.5-inch naval howitzer|
On SS Boonah
|Place of origin||United Kingdom|
|In service||1917 - 192?|
|Used by||British Empire|
|Wars||World War I|
|Weight||Gun & breech 812 pounds (368 kg)|
|Barrel length||Bore 63.75 inches (1.619 m)|
|Shell||HE 100 pounds (45.4 kg)|
|Calibre||7.5-inch (191 mm)|
|Breech||single-motion interrupted screw|
|Muzzle velocity||480 feet per second (146 m/s)|
|Maximum range||2,100 yards (1,920 m)|
|Filling weight||43 pounds (19.5 kg)|
The weapon was developed together with other similar devices early in 1917 and went into service in June 1917 in response to German unrestricted submarine warfare. It was mounted on merchant ships and patrol vessels. By 10 December that year, 377 were in service.
The shell was fired at the submarine either on the surface or submerged - hence it had attributes of both armour-piercing shell and depth charge. It was designed to first penetrate the submarine's outer hull without breaking up, and then detonate against the inner hull after a 2-second delay, destroying the submarine.
Writing a few years after the gun had gone into service, Admiral Jellicoe commented: "This weapon, although not very popular at first, soon, however, proved its value, when employed both from patrol craft and from merchant ships."
- Hogg and Thurston 1972, Pages 148-149
- Standard shell was 100 lb, containing 43 lb TNT. In early 1918 a 500 lb stick bomb containing 250 lb TNT was developed, with a range of 300 yards. Hogg & Thurston 1972, page 148
- Jellicoe, 1920. Chapter III
- I.V. Hogg & L.F. Thurston, British Artillery Weapons & Ammunition 1914-1918. London: Ian Allan, 1972
- Admiral John Jellicoe, "The Crisis of the Naval War", published 1920
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