[2568]. Bow handle. May be fixed or made to swivel.

[2569]. Balanced hand crank.

[2570]. Hand crank, with holes to vary the radius.

[Larger plate.]

[2571]. Locked handwheels for valves, to be movable in a certain order only.

Section 98.—APPARATUS FOR DRAWING CURVES.

(See also [p. 224].)

[2572]. Cycloidograph. The pencil is fixed to a sliding rod A, sliding in a socket on the pinion spindle B, and also is forced to travel along the slot C, in an open disc revolving between four rollers D.