Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 340
y coils // are used. These areconnected together at g and are in series with the resistance Rand the coil h across the line, which is connected to the ter-minals TT. The coils // arc in effect an electromagnet, themagnetic field of which reverses for each alternation of the 322 ALTERNATING VOLTAGES… … Fig. 362.—D^-namometer type of instrument. one direction and will cause it to move through a greater or less distance depending upon the magnitude of the current. Another type of alternating-current instrument is the one illustrated in Fig. 363, known as the inclined-coil type. A
Electric machinery
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