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It failed, as the others had done, because they required ratchet wheels, pulleys, &c.

The L lever carries a pawl which operates a ratchet wheel, placed on the handle end of the slide rest cross feed screw.

The running board was rotten and full of holes; the brake at the north end of the car would not hold on account of having a loose ratchet wheel.

There was a stop mechanism within the alarm so that each revolution of the crank caused the ratchet wheel supporting the disk of names to advance one tooth at a time.

The first impulse sent out is a long impulse and pulls up both armatures, thereby causing the pawls above and below the small ratchet wheel, shown in Fig.