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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 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.
The original design of the Mark IV was to be a large improvement on the Mark III but had been scaled back to be a mild improvement because of technical delays. The Mark V thus turned out very similar to the original design of the Mark IV – i.e. a greatly modified Mark III. Four hundred were built, two hundred each of Males and Females.
The larger gun required the removal of the third crewman in the turret (the wireless operator). Turret hatches were rearranged with the new gun and crew layout. About 2,000 units built. AA Mark I The Mark I fitted with a different turret (by Stothert & Pitt) mounting four 7.92 mm Besa machine guns able to elevate to near vertical and an AA ...
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 ...
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The earlier wartime Mark I, Mark II and Mark II* versions of the Besa 7.92 mm were declared obsolete in 1951 and all Mark III versions were converted to Mark III*. The Mark III/2 introduced in 1952 was a conversion of the Mark III* with a new bracket and body cover. The later Mark III/3 introduced in 1954 was a conversion of the Mark III/2 that ...
The Cruiser tank Mk V or A13 Mk III Covenanter was a British cruiser tank of the Second World War.The Covenanter was the first cruiser tank design to be given a name. Designed by the London, Midland and Scottish Railway as a better-armoured replacement for the Cruiser Mark IV, it was ordered into production in 1939 before pilot models were