The Lewis Machine Gun

The machine guns came to dominate the battle fields of WWI.  It was a primitive device with a heavy weight and was not suited for rapidly advancing infantry troops.  Each weighed 30-60 Kgs often without their mounting, carriages, and supplies.  It theory they could fire 400-600 rounds per minute.  In reality once the machine overheated it would become inoperable.   They were consequently fired in short rather than sustained bursts.  Cooling was possible either through water or water jackets. Once these guns were redesigned to become lighter and more accurate, they soon found their way into vehicles, naval vessels,  and aircrafts.

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