| 3"/23 caliber gun | |
| Origin: | United States |
| Type: | |
| Is Artillery: | "yes" |
| Service: | 1913—1946 |
| Used By: | US Navy |
| Wars: | World War I World War II |
| Manufacturer: |
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| Variants: | Mark 9, 13, and 14 |
| Weight: |
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| Length: |
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| Part Length: |
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| Cartridge: | 16.5lb 76.2x234 mm R |
| Caliber: | 3inches |
| Rate: | 8 – 9 rounds per minute |
| Velocity: | 1650ft/s |
| Range: |
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| Elevation: | -15° to +65° or +75° |
| Traverse: | 365° |
The 3-inch/23-caliber gun (spoken "three-inch-twenty-three-caliber") was the standard anti-aircraft gun for United States destroyers through World War I and the 1920s. United States naval gun terminology indicates the gun fired a projectile 3 inches (76 mm) in diameter, and the barrel was 23 calibers long (barrel length is 3" × 23 = 69" or 1.75 meters.)[1]
The built-up gun with horizontal sliding breech block weighed about 531 pounds (241 kg) and used fixed ammunition (case and projectile handled as a single assembled unit) with a 13-pound (6 kg) projectile at a velocity of 1650 feet per second (500 m/s).[2] Range was 10,100 yards (9235 meters) at 45 degrees elevation.[2] Ceiling was 18,000 feet (5500 meters) at the maximum elevation of 75 degrees.[3]
The 3"/23-caliber cannon was the first purposely designed anti-aircraft cannon to reach operational service in the US military, and was a further development of a 1-pounder cannon concept designed by Admiral Twining to meet the possible threat from airships being built by various navies.[4]
A partially retractable version was mounted as a deck gun on the US L-class,,, and O-class submarines.
When World War II began, the 3"/23-caliber gun was outdated, and surviving United States destroyers built during the World War I era that were armed with the 3"/23-caliber were rearmed with dual-purpose 3"/50-caliber guns. Where there was no air threat during World War II, the 3"/23-caliber gun was employed in the surface-to-surface role for use against submarines, and was mounted on submarine chasers, armed yachts, and various auxiliaries.[2] Some major warships carried 3"/23-caliber guns temporarily while awaiting installation of quad 1.1"/75-caliber guns.[2]
The 3"/23-caliber gun was mounted on: