pulley, then stick the pencil ends through the screw-eyes in strips A, and glue the spool-end wheels on to them. The rear axle is like the front one, with the spool pulley omitted (Fig. 203).
The Upper Shaft shown in Fig. 201 supports a spool pulley like the one on the front axle, and its screw-eye bearings should be screwed into the top edge of the sides of the box (Fig. 200), directly over the front axle. Slip a silk- spool on to each end of this shaft to keep its ends from slipping out of the screw-eyes.
Figs. 201-203.—Details of Axle and Belt Shaft.
The Belts. As you will see by Figs. 200 to 202, the upper large pulley is belted to the motor pulley, and another belt extends from the upper shaft down to the pulley on the front axle. Rubber-bands make the best belts. Cut a hole through the bottom of the cigar-box for the belt extending from the upper shaft to the front axle to pass through. Screw the toy motor to the cigar-box with its pulley directly in line with the upper shaft pulley.
