An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 630
agrams ELECTROMAGNETIC WAVES 563 in figure 417. The rapid oscillations 0 ABC D E F representthe high-frequency alternating currents steadily supplied tothe sending antenna when no telephonic transmission occurs.But when a microphone transmitter is put in the sending cir-cuit, the amplitude of these… … Fig. 417. Diagram illustrating the production of sound by the modificationin the amplitude of very high frequency currents. 381. Apparatus needed. Since the receiving circuits areidentical for radio tele phony and for radiotelegraphy, weshall consider only the sending apparatus. In fact, the…
Electricity · Magnetism
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