. The Bell System technical journal . f 600 ohmswill be presented at the monitoring terminals. The average gain of the amplifier with the potentiometer set at itsmaximum position is 33 db. Of 100 amplifiers measured, the gainat 35 cycles averaged .10 db less than the gain at 1,000 cycles whilefrom 100 to 8,000 cycles the gain was constant within .05 db. Thedelay at 50 cycles is approximately .6 millisecond greater than it isat 1,000 cycles. From 150 to 8,000 cycles the delay is substantiallyconstant and is only a small fraction of a millisecond. The amplifier iscapable of handling an output po


. The Bell System technical journal . f 600 ohmswill be presented at the monitoring terminals. The average gain of the amplifier with the potentiometer set at itsmaximum position is 33 db. Of 100 amplifiers measured, the gainat 35 cycles averaged .10 db less than the gain at 1,000 cycles whilefrom 100 to 8,000 cycles the gain was constant within .05 db. Thedelay at 50 cycles is approximately .6 millisecond greater than it isat 1,000 cycles. From 150 to 8,000 cycles the delay is substantiallyconstant and is only a small fraction of a millisecond. The amplifier iscapable of handling an output power 9 db above reference volumewithout noticeable distortion. At several points along a program circuit taps or branches are pro-vided so as to connect various broadcasting stations to the programcircuit and also to connect to other program circuits which form partof a broadcasting network. Points where such connections or branchesare made are commonly called bridging stations. At some points as 362 BELL SYSTEM TECHNICAL JOURNAL 5100. WIDE-BAND OPEN-WIRE PROGRAM SYSTEM 363 many as six branches are supplied but generally only two or three tapsare utilized. To accomplish this branching out at a bridging station a resistancenetwork multiple is provided, having six outlets. This networkmultiple is shown on Fig. 11. To annul the loss of the network asingle stage amplifier is connected in front of it. This network mul-tiple and amplifier are mounted on the same panel forming a singleintegral unit. The network multiple is so proportioned that if anyone of the branches is accidentally opened or short-circuited the otherbranches are affected to only a minor degree. The amplifier is ad-justed so that the gain from the input terminals to any of the outputbranches is zero. The bridging amplifier is normally inserted imme-diately in front of the line amplifier. As in the case of the lineamplifier mentioned above, high inductance coils are utilized in orderto keep phase distortion at a minim


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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1