. An elementary manual of radiotelegraphy and radiotelephony for students and operators . n asimilar manner to that of the diaphragm against which speech isbeing made. This receiving diaphragm will then reproduce at thedistant end the same variations of air pressure as those whichactuated the transmitting diaphragm, and a human ear placed inproximity to it will therefore hear the speech being made at thedistant place. In telephony with wires, the movements of the transmittingdiaphragm are made to translate themselves into correspondingvariations in the strength of an electric current in the co
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . n asimilar manner to that of the diaphragm against which speech isbeing made. This receiving diaphragm will then reproduce at thedistant end the same variations of air pressure as those whichactuated the transmitting diaphragm, and a human ear placed inproximity to it will therefore hear the speech being made at thedistant place. In telephony with wires, the movements of the transmittingdiaphragm are made to translate themselves into correspondingvariations in the strength of an electric current in the connectingwire by means of the variation in resistance which takes placewhen carbon surfaces are more or less pressed together, and there-translation of this variable electric current into the movementof a receiving diaphragm is made to take place by means of thevariations in the polar strength of a permanent magnet whichtakes place when an electric current of varying strength circulatesround that pole. To achieve radiotelephony we remove the interconnecting wire r I Vow«l 4 ftji lu ^.. Simple Form of 66 Sound as in Coo. I » ♦ I • I I M I M •» •» •» •! 4 4 •» 4 4 4 4 •• 4 4 » S 4 1 Complex Form of 60 Sound as in Coo.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
