By gripping the endless rope between grip wheels (see [1208]) the small wheel can be thrown into gear to grip the rope by a lever, cam or screw.
c.
Differential gear may be driven from a shaft by belts or gearing. See [Sections 84] and [3].
d.
Screw gear. Ditto.
e.
Rack gear. Ditto.
f.
Worm and wheel gear. Ditto.
g.