Ballard, William Cyrus, Jr · New York [etc.] McGraw-Hill company, inc. · leaf 22
. In 6 HIGH-FBEQUMNCY CURRENTS 7 spite of the heat storage of the filament, flickering is fre-quently noticeable on 15- and 25-cycle circuits. The frequencies used in radio work are very much higherthan those employed in power work. Radio frequenciesrange from about 15,000 cycles up to several… … Fig. 3.—Alternating-current wave of 60 cycles frequency. while radio waves are electromagnetic disturbances. Lightand heat are electromagnetic ether disturbances similarto radio waves but of very much higher frequencies. Fig. 4has been drawn with the idea of comparing the varioussound and…
Radio
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
