Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 180
tele-phones are removed from the local circuit of a given receiving set and the microphonicrelay winding W substituted. Immediately in front of the magnet is placed a diaphragmwhich may be tuned mechanically to the spark frequency of the transmitter. The diaphragm carries the carbon button A; the… … 170 PRACTICAL WIRELESS TELEGRAPHY.
Telegraph, Wireless
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