In Fig. 159 we have a mechanism combining two escape wheels
engaging each other in gear; of the two wheels, _R R'_, one alone is
driven directly by the train, the other being turned in the opposite
direction by its comrade. Both are furnished with pins _c c'_, which act
alternately upon the pallets _P P'_ disposed in the same plane upon the
verge _V_ and pivoted between the wheels. Our drawing represents the
escapement at the moment when the pin _C'_ delivers its impulse, and
this having been accomplished, the locking takes place upon the pin _C_
of the other wheel upon the pallet _P'_. Another system of two escape
wheels is shown in Fig. 160, but in this case the two wheels _R R_ are
driven in a like direction by the last wheel _A_ of the train. The
operation of the escapement is the same as in Fig. 159.
[Illustration: Fig. 164]
[Illustration: Fig. 165]
In Fig. 161 we have a departure from the road ordinarily pursued. Here
we see an escapement combining two levers, invented by the Chevalier de
Bethune and applied by M.
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