3 Inch / 50 Cal Gun (Mk 22) FIRE!
The 3" / 50 cal. (Mark 22) Gun is on an open, pedestal-type, dual-purpose mount. The gun is positioned by manually operated training and elevating gear. The elevation limits on the gun are approximately 13 degree depression and 85 degree elevation. Training stops are installed to prevent training the line of fire into the ship's superstructure. After the sights are set, the gun is positioned by the pointer and trainer bringing their telescopes on the target. The ammunition is hand loaded and hand rammed. The Slater's guns used director control for more accurate firing.

The ammunition used in the 3"/50 cal. Gun is the fixed type designed for an initial velocity of 2,700 f.s. The maximum horizontal range is approximately 12,000 yards, and the maximum ceiling range about 21,000 feet. The projectiles used in the 3"/50 cal. Gun include antiaircraft, common, armor piercing, and illuminating. These projectiles all weigh approximately 13 pounds, and the different types vary in length from about 9 to 13 inches.

3
View of 3 Inch Gun
Gun #2, Main Deck, Bow
3
Left Side detail, 1st Gun, Bow, Main Deck
A typical 3"/50 cal. Mount is bolted to the deck and supports the roller-bearing paths and the training rack. The elevating and training hand wheel gear, seats for the pointer and trainer, and platforms for the sight setter and checker are attached to the carriage. The gun recoils about 11 inches. The Slater has Mark 21 mounts with fixed prism telescopes for the pointer, trainer, and sight checker. These, along with auxiliary peep-and-ring type open sights, are mounted on a sight yoke supported by the slide. The sight-setting gear is on the left side of the gun abaft the pointers station and the sight checker is stationed on the right side near the trainer.		3 Inch front view
Front detail, 1st Gun, Bow, Main Deck
3 Inch left side3 inch right side
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New York State Division of Military and Naval Affairs: USS Slater
26 November 1999 (mjs)
URL:http://www.dmna.state.ny.us/slater/weapons/3inch.html