Back to Back
His design connected two guns back to back, with the backwards-facing gun loaded with lead balls and grease of the same weight as the shell in the other gun, acting as a counter. His idea was used experimentally by the British and Americans as an anti-Zeppelin and anti-submarine weapon mounted on the British Handley Page O/100 bomber and the American Curtiss HS-2L and H-16 (flying boats) respectively. The direct development of the gun ended with World War I, but the firing principle has been copied by later designs.
The gun was made in three sizes of 1.57 inch (3.9878 cm), 2.45 inch (6.223 cm), and 3 inch (7.62 cm), taking 2 pound (Approximately 0.9 kilograms), 6 pound (Approximately 2.72 kilograms) and 12 pound (Approximately 5.44 kilograms) shots respectively. The 3 inch (7.62 cm) carried a pressure 15 tons per square inch when fired. Usually a Lewis machine gun was mounted on top of the Davis gun's barrel which was then used for sighting and as an auxiliary and anti-aircraft weapon.
- Robey-Peters Gun-Carrier
- Patent 1108714
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