d a segmentof a toothed wheel D D, whichproduces the effect of solidaritybetween them. The two pendulums oscillate inversely one to theother, and one after the other receives an impulse. This escape-ment was constructed by Jean Baptiste Dutertre, of Paris. Fig. 154 shows another disposition of a… … Fig. 155 History of Escapements. 161 inequality in the duration of the oscillations. In watches thecircular balances did not afford any better results than the regu-lating rods or rules of the clocks, and the pendulum, of course,was out of the question altogether ; it therefore became imperativeto…
Clocks and watches
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