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,
139-3/8 inches; inside diameter, 130 inches; width, 50-3/4 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,
82-1/2 inches. Top plate, nickel steel, oil-tempered, 1-1/2 inches
thick. Shield, face-hardened nickel steel, 10 inches thick, 66 inches
high.
[Illustration: 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.
_Courtesy of the Bethlehem Steel Co._]
[Illustration: FRONT DOOR, WITH TIME LOCK, FOR ARMOR PLATE SAFE DEPOSIT
VAULT
Thickness of front door plate, 12-1/2 inches; weight of door plate,
12,000 pounds.
_Courtesy of the Bethlehem Steel Co._]
[Illustration: _Reproduced by permission of the Philadelphia Museums._