Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 54
or turn the coil. When the tensionof the spring is equal to the pull of themagnetic field, the pointer comes to restand the reading of the instrument may thenbe observed. An external resistance coil,R, is connected in series with the windingof the bobbin to reduce the flow of cur-rent to a minimum… … Fig. 47—Mechanism of Voltmeter. AMMETER
Telegraph, Wireless
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