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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 327

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 327
pon the audio-fre- 300 KADIOTELEPHONY quency change in potential produces both a radio-fre-quency oscillation and an audio-frequency pulse in theplate circuit. The audio-frequency pulse gives rise to thetone heard in the receiver. The radio-frequency oscilla-tions, in passing through the coil, E,… … lyWwJ vwvwA 6

Radio

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