Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 84
r which requires a driving forcedirectly proportional to the speed of rotation, the mercury motor generator becomes ameter. . The speed of such a meter is a measure of the current or the rate of flow of theelectricity through the motor element and each revolution of the motor corresponds to agiven… … I I III III BATTERY CHARGINGGENERATOR AMMETER
Telegraph, Wireless
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