286 [MACHINE GUNS. spindle gg causes the worm/ to act on the pinion iv, making the carrier, which consists of ten grooves or chambers M the axis and barrels revolve. A drum T (figs. 20, 24, 25) (fig. 23) corresponding to the ten barrels. The construction of the lock is shown in fig. 26. It consists of a bolt, through Fig. 21. Fig. 22. is placed on the top at the breech end of the barrels over a hopper, through a slot in which the cartridges drop into Fig. 24. Fig. 25. which passes a striker driven by a spiral spring. AAAA is a cam, sloping as in the drawing, which it must be under stood represents the circular construction opened out and laid flat. As the barrels, carrier, and locks revolve, the slope of the cam forces the locks forward and backward alternately. At position I. the cartridge has just fallen into the carrier, the lock and bolt are completely withdrawn. At positions II., III., IV., the cam is forcing them forward, FIG. 26. Lock of Gatling Gun. so that the bolt pushes the cartridge into the barrel. At IV. the cocking cam II begins to compress the spiral spring, releasing it at V. Position VI. shows the cartridge just
after firing ; the extracting hook, omitted in the previous