File: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 (14733752366).jpg

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Identifier: radiomiracleof2000drin (find matches)
Title: 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
Year: 1922 (1920s)
Authors: Drinker, Frederick E. (from old catalog) Lewis, James G., (from old catalog) joint author
Subjects: Radio
Publisher: (Philadelphia, Printed by National publishing co.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ows it the greater thewaves. Just so it is with the radio waves. The moreamperes of current flowing in the antenna circuit and thegreater the pressure between antenna and ground, thenthe stronger the waves that are radiated. RADIO SOUND WAVES. Eadio waves are very similar to sound waves. If youstrike C on the piano the sound waves vibrate 256times per second, and either a C tuning fork or a wiretuned to i i C and in the immediate vicinity will vibrate256 times per second, also. These two wires are tech-nically described as being in resonance. Just so the radiowaves have a definite number of vibrations per secondand in order to hear a certain station the receiving equip-ment must be put in resonance with the waves radiatedby the transmitter. This is properly called tuning. An electrical current changing its direction of flow isknown as an alterating current. The frequency withwhich it changes its direction gives it its nomenclature.By high frequency is meant a current which changes its
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27 July 2014



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current20:03, 23 March 2019Thumbnail for version as of 20:03, 23 March 20193,008 × 1,892 (719 KB)SteinsplitterBot (talk | contribs)Bot: Image rotated by 90°
14:52, 26 September 2015Thumbnail for version as of 14:52, 26 September 20151,892 × 3,016 (723 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Identifier''': radiomiracleof2000drin ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fradiomiracleof2000drin%2F fin...

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