. A system of multiplex telephony by the use of vacuum tubes . the40 turn circuit, the SO turn circuit could bebrought in or out by adjustments of the line and re-ceiver condensers. 41 Beat tones were eliminated when this final settinewas accoDiplished , and conversation proceeded withthe quality and loudness ordinarily obtained witha common battery telephone. A wavenieter was no?/ placed in inductive rel-ation to each of the circuits. The condition indic-ated was very satisfactory; for the two circuitswhich were adjusted for best transmission, eachshowed a waveleno-th of exactly 800 meters. T
. A system of multiplex telephony by the use of vacuum tubes . the40 turn circuit, the SO turn circuit could bebrought in or out by adjustments of the line and re-ceiver condensers. 41 Beat tones were eliminated when this final settinewas accoDiplished , and conversation proceeded withthe quality and loudness ordinarily obtained witha common battery telephone. A wavenieter was no?/ placed in inductive rel-ation to each of the circuits. The condition indic-ated was very satisfactory; for the two circuitswhich were adjusted for best transmission, eachshowed a waveleno-th of exactly 800 meters. Theother 80 turn circuit showed a waveleno-th of 2100meters. These wavelengths are indicative of fre-quencies of 375,000 and 143,000 cycles respectively. The diagrams which accompany this discussiondo not show the potential and current rheostates,meters and auxilliarv equipment necessarv in theexperimental circuits. The photographs show theapparatus for the two and three circuit arrang-emientsIn each of them some of the important pieces ofa^oparatus are tD a •i-t TS i-l • .r^ t>> p be pq o f—1 c o •f-4 c t? j=i ^ o OJ «4-( t^ o t^-l TS o c p^ (D +J XI J3 -^ -*J ;3 •c-» o -»-3 CO ai C +J 1—1 CO U ffj S3 !=l O -^ S cd ^H ^ -=3} c5 P4 &. -S3 i^jl^l
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Keywords: ., bookcentury1900, bookdecade1910, bookidsystemofmult, bookyear1919
