Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 364
d to deflect and are calibrated by comparison with otherforms of voltmeters. The type of electrostatic voltmeter, shown inFig. 37, is designed for potentials of 3000 to 10,000 volts. In some forms of electrostatic voltmeters, the charges areincreased for lower potentials by auxiliary condensers… … Fig. 38. Westinghouse Portable Induction Ammeter INDUCTION INSTRUMENTS Principle of Action. Induction instruments are suitable foralternating current only, and depend upon the principle of a rotatingmagnetic field, which is energized by the current to be measured,acting on a closed-circuited…
Electrical engineering
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