When the tooth of a cylinder escape wheel while performing its
functions, strikes the cylinder shell, it rests dead on the outer or
inner surface of the half shell until the action of the balance spring
has brought the lip of the cylinder so that the impulse face of the
tooth commences to impart motion or power to the balance.
[Illustration: Fig. 122]
[Illustration: Fig. 123]
[Illustration: Fig. 124]
[Illustration: Fig. 125]
[Illustration: Fig. 126]
[Illustration: Fig. 127]
[Illustration: Fig. 128]
Most writers on horological matters term this act the "lift," which name
was no doubt acquired when escapements were chiefly confined to pendulum
clocks. Very little thought on the matter will show any person who
inspects Fig. 126 that if the tooth _C_ is released or escapes from the
inside of the half shell of the cylinder _A_, said cylinder must turn or
revolve a little in the direction of the arrow _j_, and also that the
next succeeding tooth of the escape wheel will engage the cylinder on
the outside of the half shell, falling on the dead or neutral portion of
said cylinder, to rest until the hairspring causes the cylinder to turn
in the opposite direction and permitting the tooth now resting on the
outside of the cylinder to assume the position shown on the drawing.
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