International Library of Technology · Scranton, International Textbook Co. · leaf 309
le is damped or steadied by the vanes F moving in thepartially closed boxes D. Other types of electrostatic instruments are made, butthey all work on about the same principle. They do not,of course, require any current for their operation and canbe connected across high-pressure lines without the… … Fig. 20. tn d voltmeter switch or plug. Fig. 20 shows one of the simplestforms of switch used for this purpose. This is suitable fortwo dynamos, and its method of operation is obvious from thefigure. The voltmeter is connected to terminals 1 and 2y 18 ELECTRIC LIGHTING. 17 and the dynamos A, B to 3…
Electrical engineering
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