Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 181
170 PRACTICAL WIRELESS TELEGRAPHY. … Fig, 197a—Brown Amplification Relay for IncreasingRadio Signals. and the circuit continues through the head telephones P-1. During the reception of radiosignals the vibration of the diaphragm P causes greater vibration of the diaphragm of thehead telephone P-2 due to the larger value of current…
Telegraph, Wireless
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