[406]. Ball and socket crank motion. The crank pin is always horizontal.

[407]. Segment lever, with cord and pulley.

[408]. Double geared cranks, used for driving rotary blowers, &c.

[409]. J. Warwick’s patent; circular motion converted into reciprocating by a diagonal sheave grooved as shown; the crank arm centre is in line with the centre of the sheave, as shown in dotted lines.

[410]. Rolling sectors, with thrust motion to crank pin. Used in Outridge’s box engine with double pistons; this gives a constant rectilinear thrust to the crank pin at all points in the stroke, and no part is in tension.

[Larger plate.]

[411]. Weight and multiplying pulleys, used for clock motions, driving any light machines, &c.

[412]. Oscillating clutch arm and ring, silent feed motion.

[413]. Slot and roller motion for crank. The crank pin has a friction roller, which runs in a covered slot in the crosshead.