Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 83
e voltage of the generator falls below the battery. In event of either happening, theplunger drops downward, breaking the circuit. 72. The Ampere-Hour Meter.A particularly useful instrumentfor denoting the state of chargeor discharge of a storage batteryis the ampere-hour meter, which inessence is…
Telegraph, Wireless
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