Fig. 95.

Fig. 96.

Motion is given to all the parts by the cams (a, [Fig. 96]), which are attached to the three steel disks, b, at opposite extremities of a diameter, and the whole is rotated around an axis, c, by means of a crank, d. The parts abc form the main crank, which is supported in journal-boxes that are locked into the body of the rear case as shown in [Fig. 95].

Fig. 97.

The Lock ([Fig. 97]) in form resembles the letter U, having an extension from its side which contains the firing-pin, h; the mainspring, i, whose ends abut against the collar, k, on the firing-pin, and the sector-sleeve, l, which slides over the firing-pin; the sector or spring-compressor, n; the extractor, b; the sear, e; and the sear-spring, j. The U part of the lock, that works under and around the cam, is curved at the inner front to correspond with the outer circle of the cam, the office of the curved front being to hold the lock in position for firing. The circular firing-pin is flattened a portion of its length near the front end, to allow it to pass under the extractor, by which it is held in position. It extends from the head of the lock through the mainspring and sector-sleeve, terminating in a head, m, for locking into the sear. The sear, e, pivoted in the centre of the lock, holds the firing-pin securely, and prevents it from touching the cartridge until it is released from its hold by the action of the cam, when the lock is in its extreme forward position.