163. We should
not imagine that it enjoyed a very extensive application. Here the two
levers are completely independent of each other; they act upon the piece
_B B_ upon the axis _V_ of the fork. The counter-weights _C C'_ maintain
the arms carrying the rollers _D D'_ in contact with the piece _B B'_
which thus receives the impulse from the wheel _R_. Two adjusting screws
serve to place the escapement upon the center. By degrees these
fantastic constructions were abandoned to make way for the anchor recoil
escapement, which was invented, as we have said, in 1675, by G. Clement,
a horologist, of London. In Fig. 164 we have the disposition of the
parts as first arranged by this artist. Here the pallets are replaced by
the inclines _A_ and _B_ of the anchor, which is pivoted at _V_ upon an
axis to which is fixed also the fork. The tooth _a_ escapes from the
incline or lever _A_, and the tooth _b_ immediately rests upon the lever
_B_; by the action of the pendulum the escape wheel suffers a recoil as
in the pallet escapement, and on the return of the pendulum the tooth
_c_ gives out its impulse in the contrary direction.
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