[Illustration: Fig. 160]
[Illustration: Fig. 161]
It was not until 1695 that the first _dead-beat escapement_ appeared
upon the scene; during the interval of over twenty years all thought had
been directed toward the one goal, viz.: the perfecting of the _verge
escapement_; but practice demonstrated that no other arrangement of the
parts was superior to the original idea. For the benefit of our readers
we shall give a few of these attempts at betterment, and you may see for
yourselves wherein the trials failed.
Fig. 157 represents a _verge escapement_ with a ratchet wheel, the
pallets _P P'_ being carried upon separate axes. The two axes are
rigidly connected, the one to the other, by means of the arms _o o'_.
One of the axes carries besides the fork _F_, which transmits the
impulse to the pendulum _B_. In the front view, at the right of the
plate, for the sake of clearness the fork and the pendulum are not
shown, but one may easily see the jointure of the arms _o o'_ and their
mode of operation.
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