Fig. 5. Zinc bob and wood rod to replace imitation gridiron pendulum. 32 THE MODERN CLOCK. would have to be hung from a cast iron bracket, Fig. 6,bolted through the clock case to the wall behind it, so as toget a steady rate. It would be nearly constant, as the metalis spread out so as to be… … n Fig. G. Cast iron bracket for lieavy pendulums and movements. weight would overcome minor disturbances due to vibrationof the building. It would require a little heavier suspensionspring, in order to be isochronous in the long and shortarcs and this thickening of the spring would need the…
Clocks and watches
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