Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 24
nsi- EIGH-FBEQUENCY CURRENTS 9 tive to a rather restricted band of frequencies, otherwise wewould be able to see radio signals as flashes of hght. Radiotelegraph signals would be recognized as alternate flashes ofMght followed by periods of total darkness and radio tele-phone signals would… … Damped Wave Fig. 5.—Sustained or continuous and damped waves. be found if radio receiving sets could be tuned to these par-ticular ranges. Damped and Sustained Waves.—There are two generaltypes of alternating currents useful in radio transmission,(a) those producing sustained waves and (6) those…
Radio
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