[158]. Four-bolt camplate, used for screwing dies, locks for fireproof safes, &c.

[159]. Slot, cam, and lever motion.

[160]. Barrel motion for musical instruments, looms, &c., in which the barrel is provided with pins or staples to lift the respective levers.

[Larger plate.]

[161]. Drum with spiral vanes of long pitch, operated by a revolving arm on a shaft at right angles to the cam shaft, used for intermittent circular motion.

[162]. Volute and lever.

[163]. Double screw, for converting circular into reciprocating motion; has a right and left hand screw thread, and a shuttle attached to the lever end shaped to fit the thread, and capable of swivelling to turn the angle for reversing.

[164]. Eccentric ring and roller motion, for converting circular into reciprocating motion.

[165]. Triangular cam. Gives three reciprocations to the sliding bar in one revolution of the cam.