Field Proof Gun

Field-Proof Gun. A special shot gun for taking simultaneously the recoil and pressures at 1 inch and 6 inches from the breech. The velocity and pattern can also be taken at the same time. The gun weighs 50 lbs and is suspended 5 ft below the supports it is fired by means of a pneumatic bulb in order not to disturb the gun. The gpn and support are shown in Fig F2... 

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