| EOC 12 inch 45-calibre naval gun 12"/45 41st Year Type | |
| Origin: | United Kingdom |
| Is Ranged: | yes |
| Is Artillery: | yes |
| Is Uk: | yes |
| Service: | 1906–1952 |
| Used By: | United Kingdom Brazil Empire of Japan |
| Part Length: | Bore 45feet (45 cal) |
| Caliber: | 12sigfig=4NaNsigfig=4 |
| Cartridge: | 850lb |
| Velocity: | 2700ft/s - 2800ft/s |
| Max Range: | 18850yd |
The EOC 12 inch 45 calibre gun were various similar 12-inch wire-wound naval guns designed and manufactured by Elswick Ordnance Company to equip ships that the parent company Armstrong Whitworth built and/or armed for several countries before World War I.
Elswick supplied its 12-inch 45-calibre guns for the s completed by itself and Vickers in 1910 for Brazil.
When World War I began, Elswick were completing the battleship for the Ottoman Empire, originally begun as for Brazil. It was armed with 14 of a slightly later version of Elswick's 12-inch 45-calibre guns. The battleship was completed as and served in the Royal Navy in World War I, with its guns designated BL 12 inch Mk XIII.[1] The gun's performance was similar to the standard Royal Navy equivalent gun, the BL 12 inch Mk X designed by Vickers.
Elswick supplied its 12-inch 45-calibre guns to the Imperial Japanese Navy, and they were also manufactured under licence in Japan. In Japanese service from 1908 they became 12"/45 41st Year Type and later after the navy metricised in 1917, 30 cm/45 41st Year Type. They equipped the following ship classes: