Watch and clock escapements; . Fig. 159 History of Escapements. 163 did Galileo, in the application of the pendulum, to have priority inthe idea. Huygens, who had discovered and corrected the irregu-larities in the oscillations of the pendulum, did not think of those ofthe balance with the spiral spring. And it was not until the closeof the year 1750 that Pierre Le Roy and Ferdinand Berthoudstudied the conditions of isochronism pertaining to the spiral. AN INVENTION THAT CREATED MUCH ENTHUSIASM. However that may be, this magnificent invention, like theadaptation of the pendulum, was welcomed w
Watch and clock escapements; . Fig. 159 History of Escapements. 163 did Galileo, in the application of the pendulum, to have priority inthe idea. Huygens, who had discovered and corrected the irregu-larities in the oscillations of the pendulum, did not think of those ofthe balance with the spiral spring. And it was not until the closeof the year 1750 that Pierre Le Roy and Ferdinand Berthoudstudied the conditions of isochronism pertaining to the spiral. AN INVENTION THAT CREATED MUCH ENTHUSIASM. However that may be, this magnificent invention, like theadaptation of the pendulum, was welcomed with general enthu-siasm throughout the scientific world : without spiral and withoutpendulum, no other escapement but the recoil escapement was. Fig. 160 Fig. 161 possible ; a new highway was thus opened to the searchers. Thewater clocks (clepsydrae) and the hour glasses disappeared com-pletely, and the timepieces which had till then only marked thehours, having been perfected up to the point of keeping more exacttime, were graced with the addition of another hand to tell off theminutes. It was not until 1695 that the first dead-beat escapement appearedupon the scene ; during the interval of over twenty years all thoughthad been directed toward the one goal, viz.: the perfecting of theverge escapement; but practice demonstrated that no other arrange-ment of the parts was superior to the original idea. For the benefitof 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 axesare rigidly connected, the one to the other, by means of the arms o o
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