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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 228

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 228
quency of the alternat-ing current was explained. It was stated that by varyingthe size of the coil B and the condenser C the fre- MIRACLE OF THE AGE 201 quency of exchange of electrical energy between them,and hence the wave length, could be regulated. Considerthe circuit shown in Figure 3. Assume… … G - Ammeter Fig. 3. 300 meters is obtained; now vary C and D and itwill be found that for a certain point, and that point only,that ammeter measuring the current gives a reading.This process is known as tuning and the point at whichthe ammeter gives a reading is known as the resonantpoint. All…

Radio

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