The _wheel-lock_ is supposed to have been invented in 1517, although a lock belonging to the writer has the date of 1509, yet it is not certain if 1569 is not meant. Nuremberg is reported to be the place of its invention, where indeed, at the time, most things were claimed to have been invented; and the city mark is constantly met with on early locks. It was an important invention, and, except for the delicacy of its mechanism and great expense of production, it was an efficient lock. It consisted briefly of a steel wheel, having from two to four grooves affixed to an axle which passed through the lock-plate, the edge of the wheel appearing through the bottom of the pan. The outer part of the axle was square for a key to fit on, and the inner had a shoulder or crank, which was connected by a shackle chain of three links to an extremely strong spring. The fire stone (pyrites) was fixed in a holder, screwed to the farther end of the lock-plate. The pan had a sliding cover. To put the lock in action a key or "spanner" was placed on the outer end of the axle, and given a 3/4 turn; by this the spring was compressed, and kept at tension by the nose of a sear, connected with the trigger, entering a small hole on the inner surface of the wheel. The pan was then primed, the sliding cover brought over it, and the pyrites holder depressed, bringing the pyrites down on the cover. On pulling the trigger the wheel revolved, its axle shoulder knocked back the pan cover and allowed the grooves to grate sparks from the fire-stone, thus firing the priming. There are numerous variations in the wheel-lock of all dates and of many nationalities. By the shape of the feeds, the number of grooves, and by the internal mechanism, and of course by the ornamentation, a tolerable idea can be got of the date or origin of a piece. It is remarkable that the earliest locks were more complete and had appliances that we fail to find in the later. Thus in Fig. 40, a type of the earliest pistol, the lock possesses a safety catch to prevent premature discharge, also a spring-catch to keep the pan cover back. Those, which would be thought advantages, are not to be found in the two examples in Plate VIII. of later date and finer workmanship. In some cases the wheel winds itself, when the pyrites holder is drawn back, thus dispensing with a key. This principle is such an obvious improvement that it seems strange it was not universally adopted. [Illustration: FIG. 39.--_Pistol by Lazarino Cominazzo. Collection of Major Farquharson._] [Illustration: FIG. 40.--_Early German Wheel-lock Pistol, used by the Reiters. Collection of Major Farquharson._]