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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 236

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 236
lephone receiver and theybecome audible. So far all seems simple, but in coupling up circuits itmust be remembered that there are three basic forms ofcoupling: i.e. direct, inductive and capacity.There are in these couplings primary and secondary cir- MIBACLE OF THE AGE 209 cuits. The primary… … EXAMPLE OF DIRECT COUPLING. or current would naturally travel to the ground. The sec-ondary circuit is that by which the waves or current aredeployed or diverted from the primary so that they travelaround the secondary and back again to the main circuit,and thence over their natural course to the…

Radio

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