. A system of multiplex telephony by the use of vacuum tubes . circuit which would respond only to fre-quencies intended for it, and which would give thesame quality of speech transmission as possessed bythe one to be abandoned. An entirely new scheme was decided upon; acombination circuit employing two tuned circuits in-stead of one. The result is shown in fi^.20. Thetransmitting and receiving portions each hsve theirown tuning; and the inductance coil of the receiveris also made the line inductance coil to absorb theenergy to be transmitted. In this way the receivedenergy passes directly int
. A system of multiplex telephony by the use of vacuum tubes . circuit which would respond only to fre-quencies intended for it, and which would give thesame quality of speech transmission as possessed bythe one to be abandoned. An entirely new scheme was decided upon; acombination circuit employing two tuned circuits in-stead of one. The result is shown in fi^.20. Thetransmitting and receiving portions each hsve theirown tuning; and the inductance coil of the receiveris also made the line inductance coil to absorb theenergy to be transmitted. In this way the receivedenergy passes directly into the receiver circuit. Itwas also found that shunting the 250 volt platebattery with a capacity of about 6 microfarads in-creased the quality of transmission. Four circuits of this type were now connectedinto the line as shown in fi!?.2I. Each set wasadjusted to give the lest transmission, and the twothen closed down together. This immediatly threwboth out of adjustment, caused considerable distor-tion of speech, and brought in beat tones. To meet jW2 ^ —. a !5 0 »:: \ ?? 4 ^ % ^ «5b f I 1 1 ?1 1 u
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Keywords: ., bookcentury1900, bookdecade1910, bookidsystemofmult, bookyear1919
