A practical Treatise on Wireless Telegraphy and Telephony, giving Complete and Detailed Explanations of the Theory and Practice of Modern Radio Apparatus and its Present Day Applications, together with a chapter on the possibilities of its Future Development
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WIRELESS TELEGRAPHY
Fig. 58.—Photo of wireless key.
An anchor gap is a simple little device consisting of
a hard rubber ring bearing two or three small electrodes
Fig. 59.—Key and aerial switch.