165. In it we see the same inclines _A B_ of the former construction,
but the locking is effected against the slides _C_ and _D_, the curved
faces of which produce isochronous oscillations of the pendulum. The
tooth _b_ imparts its lift and the tooth _c_ will lock against the face
_C_; after having passed through its recoil motion this tooth _c_ will
butt against the incline _A_ and work out its lift or impulse upon it.
THE GABLE ESCAPEMENT.
[Illustration: Fig. 168]
[Illustration: Fig. 169]
The _gable escapement_, shown in Fig. 166, allows the use of a heavier
pendulum, at the same time the anchor embraces within its jaws a greater
number of the escape-wheel teeth; an arrangement after this manner leads
to the conclusion that with these long levers of the anchor the friction
will be considerably increased and the recoil faces will, as a
consequence, be quickly worn away. Without doubt, this was invented to
permit of opening and closing the contact points of the anchor more
easily.
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