International Library of Technology · Scranton, International Textbook Co. · leaf 264
takes the place of the springs in the pre-ceding instrument. The action of the instrument is asfollows: When a current flows through the coil, a magneticfield is set up which is stronger near the coil than at thecenter. The piece of iron z> tends, therefore, to movenearer the inside of the coil,… … Fig. 1500, Instruments of the plunger type will generally work oneither direct or alternating current, but they must alwaysbe calibrated under the same conditions as those under whichthey are to be used. When intended for alternating-currentcircuits, they are always calibrated so as to read…
Electrical engineering
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