plate of the clock, as shown at P; the spring is also fast-ened to the pendulum ball O with screw?; the ball makes THE MODERN CLOCK, 93 about one and one-half revolutions each beat, which causesthe spring to twist. It twists more at the point S than itdoes at L; as it twists at L it carries the… … Fig. 18. In the most common form of this escapement, see Fig.18, the fork does not allow the pin D to leave the slot H,and the beat pins are absent, the pendulum not being ashighly detached as in the form previously mentioned. Inthis case great care must be taken to have the edges of theslot, which…
Clocks and watches
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