Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 177
Fig:. 191—Showing How the Inductance of the Radio Frequency Tuning Coil Can Be Varied by One Turn at a Time. 166 PRACTICAL WIRELESS TELEGRAPHY. … cause the sliding contact soon cuts through the wire either actually breaking the turns or short circuiting adjacent turns. By the method shown in the diagram, Fig. 191, the inductance of a single layered coil can be progressively varied from one turn to the maximum number simply through the use of…
Telegraph, Wireless
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