Twelve-inch turret carrying two forty-five caliber twelve-inch guns for the U. S. Navy. These guns can be loaded at any angle of elevation or azimuth or while in motion. The turret is equipped with a broken or double hoist. The lower hoist supplying ammunition from the magazine to an upper handling room immediately below, and revolving with, the turret pan. This makes the upper or gun hoist shorter and increases the speed of ammunition service, besides interposing two fireproof bulkheads between the guns and the magazine handling room.
Nickel Steel Field Ring Forged without Weld for a 5,000-Horse-power Dynamo. (See [page 425].)
Forged dimensions: outside diameter, 141 inches; inside diameter, 131 inches; width, 51 inches. Rough machined dimensions: outside diameter, 1393⁄8 inches; inside diameter, 130 inches; width, 503⁄4 inches; weight, 28,840 pounds. Average physical properties shown in United States Standard test bar taken from full-sized prolongation of end of forging: Elastic limit, 53,560 pounds per square inch. Elongation, 27.05 per cent.
Turret for Two Twelve-inch Guns for United States Battleship “Alabama.” (See [page 426].)
Balanced type. Thickness of inclined plate, 14 inches; of side plates, 10 inches. Height of side plates, 7 feet. Largest diameter of turret, 393 inches. Weight of turret, 192.41 tons.
Conning Tower and Entrance Shield for United States Battleship “Massachusetts.” (See [page 426].)
Conning tower, one piece hollow forging, nickel steel, oil tempered. Thickness of walls, 10 inches. Inside diameter, 83 inches. Height, 821⁄2 inches. Top plate, nickel steel, oil-tempered, 11⁄2 inches thick. Shield, face-hardened nickel steel, 10 inches thick, 66 inches high.
Safe Deposit Armor Plate Vault
Size, 42 feet 6 inches by 24 feet 6 inches by 9 feet 6 inches high; weight, 450 gross tons.