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The lock of a gun, for producing the discharge. See Lock.

The thumbpiece of the hammer of a gunlock, by which it may be cocked.

An old form of gunlock, as the flintlock, which ignites the priming by a spark; perhaps originally, a matchlock. Hence, a gun having such a lock.

To measure the dimensions of, or to test the accuracy of the form of, as of a part of a gunlock. The vanes nicely gauged on each side. Derham.

2d Back. -- Half bent, the first notch, for the sear point to enter, in the tumbler of a gunlock; the halfcock notch. -- Half binding, a style of bookbinding in which only the back and corners are in leather. -- Half boarder, one who boards in part; specifically, a scholar at a boarding school who takes dinner only.…

That part of a gunlock which strikes the percussion cap, or firing pin; the cock; formerly, however, a piece of steel covering the pan of a flintlock musket and struck by the flint of the cock to ignite the priming.

Lock nut. See Check nut, under Check. -- Lock plate, a plate to which the mechanism of a gunlock is attached. -- Lock rail (Arch.), in ordinary paneled doors, the rail nearest the lock. Lock rand (Masonry), a range of bond stone. Knight. -- Mortise lock, a door lock inserted in a mortise. -- Rim lock, a lock fasten…

a piece of mechanism, especially the moving spring of a watch or clock or the spring in a gunlock which impels the hammer. Hence: The chief or most powerful motive; the efficient cause of action.

An old form of gunlock containing a match for firing the priming; hence, a musket fired by means of a match.

The cock of a gunlock. Knight.

The tumbler of a gunlock. Knight.

A gunlock. [R.]

The catch in a gunlock by which the hammer is held cocked or half cocked. Sear spring, the spring which causes the sear to catch in the notches by which the hammer is held.

A piece attached to, or forming part of, the hammer of a gunlock, upon which the mainspring acts and in which are the notches for sear point to enter.

ng railway-car wheels. -- Wheel lock. (a) A letter lock. See under Letter. (b) A kind of gunlock in which sparks were struck from a flint, or piece of iron pyrites, by a revolving wheel. (c) A kind of brake a carriage. -- Wheel ore (Min.), a variety of bournonite so named from the shape of its twin crystals. See Bour…