acteristics peculiar to weapons of the multiple chamber type and also the key to the characteristics of rotary action guns which represent but one form of multiple chambcr weapons.

Because the concept of the multiple chamber weapon forms the basis of all rotary action weapons, it is appropriate here to examine briefly the general nature of mechanisms which fall into the multiple chambcr class. The most elementary form of the multiple chamber weapon is the battery gun or "orgue des bombarde" mentioned previously in this chapter. This gun, which consists merely of an assembly containing a number of individual complete barrels can hardly be considered as a mechanism since the only function required in its use is to obtain simultaneous or nearly simultaneous ignition of the propellant charges in all the barrels. A slightly more advanced type of weapon is exemplified by the conventional double-barrel shotgun, drillings, and other firearms which amount to nothing but two or more separate guns compactly assembled into a single stock. Although the elementary battery gun and firearms similar to the double-barrel shotgun are so simple in principle that no further discussion of them is called for here, consideration of the other forms of multiple chamber weapons brings to light a number of interesting and significant points.

One form of multiple chambcr weapon, which was conceived verv early in the history of firearms

and has since reappeared at intervals with varying degrees of success, is the type of repeating weapon which employs a group of complete barrels. The salient feature of these weapons is that repetitive fire is achieved with the tise of only one operating mechanism which serves a number of barrels. This means that for all intents and purposes, additional capacity can be built into the weapon merely by

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