Section 98.—APPARATUS FOR DRAWING CURVES.

Section 97.—HANDLES, HANDWHEELS, KEYS AND SPANNERS.Section 99.—MATERIALS EMPLOYED IN CONSTRUCTION.

(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.