Figs. 140, 138, 139. Chain pulleys and lantern-wheel
[Fig. 141]. Intermittent circular motion is imparted to the toothed wheel by vibrating the arm B. When the arm B is lifted, the pawl C is raised from between the teeth of the wheel, and travelling backward over the circumference again drops between two teeth on lowering the arm, and draws with it the wheel.
[Fig. 142]. The oscillating of the tappet-arm produces an intermittent rotary motion of the ratchet-wheel. The small spring at the bottom of the tappet-arm keeps the tappet in the position shown in the drawing, as the arm rises, yet allows it to pass the teeth on the return motion.
[Fig. 143]. A nearly continuous circular motion is imparted to the ratchet-wheel on vibrating the lever a to which the two pawls b and c are attached.
Figs. 141, 142, 143. Intermittent circular motion
[Fig. 144]. An arrangement of stops for a spur-gear.
[Fig. 145]. A reciprocating circular motion of the top arm makes its attached pawl produce an intermittent circular motion of the crown-ratchet, or ray-wheel.