We shall not show in this drawing the angular motion of the escape
wheel, but delineate at the radial lines _c e_ and _c f_ of the arc of
the balance during the extent of its implication with the periphery of
the escape wheel, which arc is one of about forty-eight degrees. Of this
angle but forty-three degrees is attempted to be utilized for the
purpose of impulse, five degrees being allowed for the impulse jewel to
pass inside of the arc of periphery of the escape wheel before the
locking jewel releases the tooth of the escape wheel resting upon it. At
this point it is supposed the escape wheel attacks the impulse jewel,
because, as we just explained, the locking jewel has released the tooth
engaging it. Now, if the train had no weight, no inertia to overcome,
the escape wheel tooth _A^2_ would move forward and attack the impulse
pallet instantly; but, in fact, as we have already explained, there will
be an appreciable time elapse before the tooth overtakes the
rapidly-moving impulse jewel.
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