The Machine Gun

power are employed. Although the major task of imparting the required motions to the heavier operating parts is accomplished through the medium of energy derived from the powder gases, some of the functions of the weapon are performed by mechanisms which receive power from external sources. For example, in many modern weapons, the feed mechanism which keeps the weapon supplied with the moving parts of the gun, thereby permitting these parts to move at maximum velocity in order that the gun may attain the highest possible rate of fire. In most modern aircraft cannon, the energy for firing the propcllant charge usually is not obtained by the impact on the primer of a sliding part of the gun mechanism but firing is accomplished by the application of a voltage obtained from an external source vj

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