12"/40 caliber Mark 3 and Mark 4 | |
---|---|
![]() View of Ohio and her forward 12"/40 caliber guns in the Mark 4 turret in 1916. | |
Type | Naval gun |
Place of origin | United States |
Service history | |
In service | 1902 |
Used by | United States Navy |
Wars | World War I |
Production history | |
Designer | Bureau of Ordnance |
Designed | 1899 |
Manufacturer | U.S. Naval Gun Factory |
No. built |
|
Variants | Mark 3 and Mark 4 |
Specifications | |
Mass |
|
Barrel length | 40 ft 0 in (12.19 m) bore (40 calibers) |
Shell | 870 lb (390 kg) armor-piercing |
Caliber | 12 in (305 mm) |
Elevation |
|
Traverse | −150° to +150° |
Rate of fire |
|
Muzzle velocity |
|
Effective firing range | 19,000 yd (17,374 m) at 15.5° elevation |
The 12"/40 caliber gun (spoken as "twelve-inch-forty--caliber") were used for the primary batteries of the United States Navy's last class of monitors and the Maine-class and Virginia-class pre-dreadnought battleships.[1]
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