12-inch/35-caliber gun

Marks 1: -3° to +15°
Marks 2: −5° to +15°
Marks 3: −3° to +14°

12"/35 caliber Mark 1 & 2 Naval Gun
12"/35 caliber Mark 1 & 2 Naval Gun
	USS Iowa – Crewmen pose by the ship's forward 12"/35 gun turret, 1898. The left-hand gun burst 9 April 1903, killing three crew men.
Type	Naval gun
Place of origin	United States
Service history
In service	1896
Used by	United States Navy
Wars	Spanish–American War; World War I;
Production history
Designer	Bureau of Ordnance
Manufacturer	US Naval Gun Factory
No. built	Mark 1: 8 (Nos. 1–8); Mark 2: 7 (Nos. 9–14, 57);
Variants	Mark 1 and Mark 2
Specifications
Mass	102,550 lb (46,520 kg) (with breech); 100,800 lb (45,700 kg) (without breech);
Length	441 in (11,200 mm)
Barrel length	425 in (10,800 mm) bore (35 calibers)
Shell	870 lb (390 kg) armor-piercing
Caliber	12 in (305 mm)
Elevation	Marks 1:-3° to +15°; Marks 2:−5° to +15°; Marks 3:−3° to +14°;
Traverse	−150° to +150°
Rate of fire	1 rounds per minute
Muzzle velocity	2,100 ft/s (640 m/s)
Effective firing range	12,000 yd (10,973 m) at 15° elevation (max elevation of turrets)
Maximum firing range	21,000 yd (19,202 m) at 30° elevation

The 12"/35 caliber gun (spoken "twelve-inch-thirty-five–caliber") were used for the primary batteries of the United States Navy's "New Navy" monitors Puritan and Monterey and the battleships Texas and Iowa.

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