Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 252
, AND RADIUM Wireless telegraphy. — The telegraph andtelephone transmitmessages from oneplace to another bymeans of wires. Thewireless telegraph, asits name indicates,transmits messageswithout the use ofwires between sta-tions. The essentialparts of the wirelesstelegraph are thesending apparatusand… … FIG. 171. — Wireless sending apparatus.237 PHYSICS OF THE HOUSEHOLD
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