St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 95
he armature I willvibrate rapidl3^ By placing a small bell near the end ofthe vibrating armature, sothat it will be struck b)^ I ateach vibration, we shouldhave a simple elecflric bell.This form of eledlric bell iscalled a trembling bell, onaccount of its vibrating ar-mature. Fig. 117 shows a form… … Fig. n8. THE ELECTRIC BELL AND SOME OE ITS USES. 93
Electricity
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