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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 ...
16"/45 caliber Mark 6 gun United States: World War II 406 mm (16.0 in) 16"/50 caliber Mark 7 gun United States: World War II - Cold War 406 mm (16.0 in) 406 mm/50 (16") B-37 Pattern 1937 Soviet Union: World War II 406 mm (15.98 in) 16"/50 caliber Mark 2 & 3 gun United States: 1920s - World War II 410 mm (16.14 in)
This led to the development of the 10-inch/40 caliber gun. [1] The Mark 3 was specifically designed for the Tennessee-class armored cruisers, numbered in order after the Mark 1 and Mark 2s, Nos. 27–47, with No. 27 being delivered in February 1906. Nos. 27–31, 36, and 45 were all Mod 0s, with Nos. 37–44, 46, and 47 being Mod 1s.
The Mark III improved upon the Mark II by providing a three-man turret. Mark III production ended in 1942 after 1,650 had been built. The Humber was a relatively complicated build compared to the Daimler Amoured Car but the Rootes Group had larger production capacity so both companies worked on a common design for production.
The Mk III gun was designed by the Elswick Ordnance Company as a modification of the Royal Arsenal (Woolwich) designs. It was trunnionless and made entirely of steel. It was connected to its carriage by way of three 'thrust-collars' which were formed on the exterior halfway round on the lower side of the gun beneath the center of gravity.
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A view through the Mark III Free Gun Reflector Sight, first produced in 1943, used on British army guns, naval guns, and as a pilot sight and a defensive gun sight on aircraft. The reticle image in this sight is produced by an optical collimator bounced off a beam splitter.