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Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development (1922)

Drinker, Frederick E. [from old catalog], Lewis, James G., [from old catalog] joint author · [Philadelphia, Printed by National publishing co.] · leaf 14

An illustration from Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development, 1922, leaf 14
tem 230 CHAPTER XXV. A Typical Spark Transmitting Circuit—Spark Gaps—Oscillation Transformers and Coupling—Tuning of a Circuit—Damping 247 CHAPTER XXVI. Other Methods of Coupling—Why Tuned Circuits Are Necessary —Resistance—Interference 263 CHAPTER XXVII. Now We Come to Vacuum Tube—Electric… … Copyright, Underwood & Underwood, N. Y.NINE-INCH ANTENNA PICKS UP EUROPEAN RADIO MESSAGESPhotograph shows a coil antenna nine inches square, yet powerfulenough to receive wave lengths of many thousand meters. This coilwhen connected to an extremely delicate receiving apparatus will detectrarJio…

Radio

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