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 366
ect current, the armatureis set in vibration, and that gives a slight movement to the baseplate at right angles to its axis, thereby affecting all the reeds,especially those that are almost exactly in tune with its vibra-tions. The reed which is exactly in tune will vibrate through anarc of… … Fig. 40.- Frahm Frequency IndicatorCourtesy of James G. Biddle, Philadelphia 330 ELECTRICAL MEASUREMENTS 35 Westinghouse Frequency Indicator. The Westinghouse fre-quency meter, Fig. 41, is of the induction type. Two induction
Electrical engineering
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