. 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 . a current consisting of a series of spurtsin one direction. That this could be done was one ofthe essential discoveries of radio. 320 RADIOTELEPHONY Resistance—The opposition offered to the flow of a cur-rent. Rheostat—A variable resistance used to regulate the flowof electric current. Selectivity—The ability to choose any
. 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 . a current consisting of a series of spurtsin one direction. That this could be done was one ofthe essential discoveries of radio. 320 RADIOTELEPHONY Resistance—The opposition offered to the flow of a cur-rent. Rheostat—A variable resistance used to regulate the flowof electric current. Selectivity—The ability to choose any wave length to theexclusion of all other waves lengths in receiving. Static—Natural electric discharges or interference by theelements of nature which are heard in radio receivingand which are the bane of all radio operators. Transformer—A device used to change electric energyfrom one state to another—either from alternatingto direct or direct to alternating under varying condi-tions. Vacuum Tube—The electron tube consisting of incan-descent bulb with film, grid and plate already de-scribed. See Audion. Volt—The unit of electrical pressure. Wave Length—The distance from the crest of one ether \wave to another, which is always computed in meters. ).
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Keywords: ., bookcentury1900, bookdecade1920, bookidradiomiracle, bookyear1922
