. A system of multiplex telephony by the use of vacuum tubes . j^/^-Z 29 cross section as shown in J^ig. 15. The coil has 40turns of Wo. 20 double silk covered wire, and ameasured inductance of .575 millihenries. The gridcircuit is coupled to the plate circuit by the coil1-2. Condenser Cj permits the hie-h frequency oscilla-tions to pass around the telephone induction coilL^. The line is coupled to the oscillating circuitby means of Lj. The grid potential of 300 volts wasobtained from storage batteries. The frequency of the receiver circuit is alsodetermined by C and L; L being coupled to Lj o
. A system of multiplex telephony by the use of vacuum tubes . j^/^-Z 29 cross section as shown in J^ig. 15. The coil has 40turns of Wo. 20 double silk covered wire, and ameasured inductance of .575 millihenries. The gridcircuit is coupled to the plate circuit by the coil1-2. Condenser Cj permits the hie-h frequency oscilla-tions to pass around the telephone induction coilL^. The line is coupled to the oscillating circuitby means of Lj. The grid potential of 300 volts wasobtained from storage batteries. The frequency of the receiver circuit is alsodetermined by C and L; L being coupled to Lj of theline. The tube operates as has already been explain-ed for tubes in a receiver circuit. The plate pot-ential of 30 volts was obtained from 15 cells offlashlight battery connected in series. The oscillating circuits of the receiver andtransmitter are adjusted to oscillate at the samefrequency. The line is then adjusted by means of thevariable condenser to approach this frequency is easy to know when the two circuits have thesame constants, for if
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Keywords: ., bookcentury1900, bookdecade1910, bookidsystemofmult, bookyear1919
