The ratchet-wheel R is attached to the hub of the driving-wheel.
A detail of one of them is shown at v in Fig. 1380, where x is the ratchet-wheel.
An' this ratchet-wheel isn't on the pawl prop'ly—not like what this book says it ought to be.
The oscillating of the tappet-arm produces an intermittent rotary motion of the ratchet-wheel.
When the tympanum vibrates under the influence ...