Fig. 10 shows the ratchet-wheel and hand or pawl by which the receiver is made to revolve to the distance from one chamber to another in the act of cocking. The cylindrical periphery _q_ of the ratchet-wheel fits into a corresponding cavity on the back end of the receiver, as shown at _q q_, Fig. 1. _r_ is a projection to prevent its turning round, this being adapted to a notch made to receive it. S is a hand or pawl, which falls into the teeth of the ratchet-wheel, said pawl being forced forward by the spring S′. The arbor _t_ on which the hand turns is received into the opening _t_. In the hammer, Fig. 1, the hand itself being on the opposite side of said hammer from that shown, its position is shown by the dotted lines surrounding its arbor _t_. The cocking of the gun causes it to act upon the ratchet-wheel, and when turned to the proper distance the bolt E is forced by its spring into the proper opening in the receiver. The mainspring is connected to the lock-plate at _u_, and to the hammer by a stirrup at V. The trigger is shown at _w_. These parts, not differing in their construction and operation from analogous parts in other gun-locks, need no particular description, and from the description above given of the structure and operation of those parts of the rifle or gun which are new, the action of the whole will, it is believed, be clearly understood. Fig. 11 is a sectional view of a pistol, the general construction of which is the same with that of the rifle or gun already described, such modifications only being made as are rendered necessary by its size and other considerations. F is the hammer carrying the hand or pawl S, which operates on the ratchet-wheel, which wheel and hand are arranged in the same way with the same parts in the rifle; but the hand is as here represented on the reverse side. The bolt which holds the receiver is, however, differently constructed to enable it to act in the space which it must occupy.