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 492
kes the cali-bration permanent and renders the readings free from the effects ofvariations in voltage, wave form, frequency, or power factor. Therecord is made on a continuous chart w^hich, at a speed of two inchesper hour, will last for two months. To obtain accurate records in spite of the… … Fig. 12;. Continuous Chart Recording Instrument Courtesy of Westinghouse. Electric and Manufacturing Company 448 ELECTRICAL MEASUREMENTS 151 closed by the meter element whenever there is a change in the quan-tity measured. The operation of the pen-moving relay principle isillustrated by the…
Electrical engineering
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