Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 120
Fig. 124—Showing How Coupling is Changed by Vario-meter. … Fig. 125—Square Coil Type Oscillation Transformer. COPPER STRIP as in Fig. 127. The inductance ofthe latter type is altered by meansof a plug contact. It is, of course,essential that adjacent turns be wellinsulated from one another andseparated so that there will be nosparking between them. Also…
Telegraph, Wireless
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