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The Mark 3 was a 48.9 calibers built-up gun designed and built in the United Kingdom for use in the two New Orleans-class protected cruisers that the US Navy had purchased from the United Kingdom before the Spanish–American War. They were based on the British 4.7-inch Gun Mark IV, but a non-standard export model, the standard Mark IV was 40 ...
The 10-inch Mark 3 Mod 0 was built in a length of 40 calibers, had a tube, jacket and four hoops with a locking ring, and a screw box liner, all of which were manufactured out of nickel-steel. [1] The Mark 3 Mod 1s only differed from the Mod 0 in the shape of the front of their chambers and the Mod 2 had a conical nickel-steel liner that was ...
The 8"/35 caliber gun Mark 3 and Mark 4 (spoken "eight-inch-thirty-five--caliber") were used for the main batteries of the United States Navy's first armored cruisers and the secondary batteries for their first battleships, the Indiana-class. The 8"/40 caliber gun Mark 5 initially armed the Pennsylvania-class armored cruisers. [1]
After the Armistice another 713 guns were produced, with orders for 3538 guns cancelled. It was decided after World War I that all destroyers would carry the 4-inch/50-caliber Mark 9 Mod 5 gun; the refits were completed in autumn 1921. [3] The Mark 10, gun No. 365-A, was ordered in 1915 but does not appear to have been completed until after WW I.
The 7-inch Mark 1 was built in a length of 44 calibers, had a nickel-steel liner, with a tube, jacket and three hoops with a locking ring, all made of gun steel, a screw box liner, and Welin breech block. The Mark 1 was hooped from the breech to 47.5 in (1,210 mm) from the muzzle.
However, due to a miscommunication between the two Navy departments involved in the design, the ships required a lighter gun than the Mark 2/Mark 3, resulting, ultimately, in the design of the 267,900 lb (121,500 kg) 16"/50 caliber Mark 7 gun. In January 1941 all but three of the remaining fifty Mark 2 and Mark 3 guns were released to the Army.
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The Mark 3, gun Nos. 15–48 and 50–56, was constructed of tube, jacket, and eight hoops. It was found that the early guns suffered from excessive bore erosion, in an attempt to fix this the Navy reduced the propellant charges to reduce the muzzle velocity, because of this the Mark 4, gun Nos. 49, 58–60, 150–154, and 179, was similar to ...