Comparison tests being performed between British Centaur Cromwell tank and U.S. M-4 tank at the Aberdeen Proving Ground in Aberdeen, Maryland. The tanks are rolled on various types of surface such as concrete, mud and sand to compare their maneuvering capabilities.
Comparison tests being performed between a British Centaur tank, a British Cromwell tank, and U.S. M-4 tank at the Aberdeen Proving Grounds in Aberdeen,Maryland. The three tanks are rolled onto various types of surface such as concrete, mud and sand to compare their maneuvering capabilities.
U.S. 30-caliber machine guns fired in Aberdeen Proving Ground, Maryland. Four 30-caliber machine guns on multiple mount with gun. The Vikers Data Computer directs the firing. The gun crew fires the machine guns.
U.S. 37mm automatic anti-aircraft gun fired in Aberdeen Proving Ground, Maryland. The 37mm automatic anti-aircraft mobile mount in a traveling position. The anti-aircraft gun is manned by the gun crew. An officer loads shells. The gun is fired.
A 3-inch anti-aircraft gun T1 fired in Aberdeen Proving Ground, Maryland. The 3-inch mobile anti-aircraft gun T1 with a muzzle velocity of 2600 feet per second in a traveling position. The gun is emplaced by the members of the crew. A river can be seen in the background. The gun is fired at a towered target by the gun crew. The target is brought down from a height of 9000 feet. Members of the crew pose.
U.S. height finders used in World War I. The Barr and Stroud anti-aircraft height finder used in Aberdeen Proving Ground, Maryland. Members of the crew use the height finders. The crew uses the Bausch and Lomb 8-foot height finder.
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