Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 112
used in most insti-uments formeasuring a direct cui-rent or voltage, and is usually knownas the movable coil between the poles of a permanent magnet ^type. It will be seen that the north pole of the coil pointsto the south pole of the magnet. If the direction of thecuirint is reversed through the… … Fig. 106 5 Fig. 107 Figs. 106 and 107.—Show principle of direct-euiTent voltmeter and ammeter. Movement for Modem-Type Instrument.—Fig. 108 showsa complete sj^stem of a modern-type instrument embodyingthe foregoing principle. To concentrate the lines of forceof the magnet on the coil, soft-iron…
Electric machinery
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