Practical wireless telegraphy; a complete text book for students of radio communication (1917)
Bucher, Elmer Eustice, 1885- · New York, Wireless Press, Inc · leaf 57
46 PRACTICAL WIRELESS TELEGRAPHY. … following manner: A wire, E, F, is attached to the center of C, D, and a silk threadattached to it at K, which is wound about the shaft in such a way as to work againstthe tension of the spring S which, normally, would cause the pointer to move to thefull scale position. However, by means of the…
Telegraph, Wireless
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