12"/35 caliber gun

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" monitor USS Puritan (BM-1), the monitor USS Monterey (BM-6), and the battleships USS Texas (1892) and USS Iowa (BB-4).

Mark 1
The Navy's Policy Board call for a variety of large caliber weapons in 1890, with ranges all the way up to 16 in, led to the development of the 12-inch/35 caliber gun. The Mark 1 was constructed of gun steel, having a tube, jacket, ten hoops and a locking ring. The Mod 0, the original design, had the inner hoop starting 6 in from the breech and running out to the muzzle, with the Mod 1 being hooped from breech to muzzle.

Mark 2
The Mark 2 was of similiar construction to the Mark 1 but with seven hoops starting from the breech and running out to the muzzle. The Mark 2 Mod 1 and Mod 2 were also given a new nickel-steel liner.