155]
ANOTHER TWO-PENDULUM ESCAPEMENT.
We show another escapement with two pendulums in Fig. 153. These are
fixed directly upon two axes, each one carrying a pallet _P P'_ and a
segment of a toothed wheel _D D_, which produces the effect of
solidarity between them. The two pendulums oscillate inversely one to
the other, and one after the other receives an impulse. This escapement
was constructed by Jean Baptiste Dutertre, of Paris.
Fig. 154 shows another disposition of a double pendulum. While the
pendulum here is double, it has but one bob; it receives the impulse by
means of a double fork _F_. _C C_ represents the cycloidal curves and
are placed with a view of correcting the inequality in the duration of
the oscillations. In watches the circular balances did not afford any
better results than the regulating rods or rules of the clocks, and the
pendulum, of course, was out of the question altogether; it therefore
became imperative to invent some other regulating system.
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