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 341
the same as the voltage in the primary. A variationin the current passing through the plate of tube II takesa path through the primary of the transformer andthrough the battery. The transformer is so arrangedthat an increase of current through P reacts through thetransformer to produce a decrease… … A radiotelephone transmitting set is readily adaptedto send telegraphic signals by means of the buzzer modu-lator method. An ordinary buzzer replaces the telephonetransmitter. The buzzer, by making and breaking thecircuit, modulates the output of the transmitter in muchthe same way as is done by a…
Radio
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