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 apparatu[sand… … Fio. 171. — Wireless sending apparatus.237 238 PHYSICS OF THE HOUSEHOLD
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