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 95
GROUND GROUND Fig. 73. Connecting Circuits for an Electro-static Ground Detector use of one or two thin vanes of soft iron mounted on a pivoted staffwithin the coil. The soft-iron type of Instrument is calibrated by the use ofdirect electromotive forces or currents, but it does not… … Fig. 74. General Electric Ground Detectorwith Cover Removed currents. A soft-iron type meter (ammeter or voltmeter) shouldbe calibrated, using alternating current of the same frequency as 78 ALTERNATING-CURRENT MACHINERY 69 that for which the meter is afterwards to be used, and of the samewave…
Electrical engineering
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