. Electrical world. ksin the toll sections and as plugs and lamps at the toll switching po-sitions on the local switchboard. In addition to this recording tolltrunk circuits are provided, which end at the recording operatorspositions in lamps and jacks, and appear as multiple jacks only ineach section of the local multiple switchboard. Locking relays andlamps controlled by them are used in both the toll line and cordcircuits in place of line and clearing-out drops. At each subscribersoperators position at the multiple switchboard, there is furnishedone or more pairs of tone test cords adapted
. Electrical world. ksin the toll sections and as plugs and lamps at the toll switching po-sitions on the local switchboard. In addition to this recording tolltrunk circuits are provided, which end at the recording operatorspositions in lamps and jacks, and appear as multiple jacks only ineach section of the local multiple switchboard. Locking relays andlamps controlled by them are used in both the toll line and cordcircuits in place of line and clearing-out drops. At each subscribersoperators position at the multiple switchboard, there is furnishedone or more pairs of tone test cords adapted to throw a specialtone busy test on to any line. With one of these cords which isintended to be connected with the jacks of the local common batterysubscribers, is associated a white lamp, and with the other, which isused to connect with the jacks of the recording toll trunks, a redlamp. The method of operation of this system in establishing a local totoll connection is as follows, reference being made to Fig. 12. A. -showing connection of local to toll WESTERN electric C. SUBSCRIBERS local subscriber desiring to talk over a long distance line will signalhis local operator and ask for toll or long distance. The oper-ator will then insert the answering plug of a pair of tone test cordsinto the multiple jack of the calling line. She will then withdrawthe answering plug of the regular pair of cords which she insertedinto the answering jack of the calling subscribers line in responseto his call. The white lamp in the tone test cord circuit will remainunlighted as the subscriber with whose line the jack is connected hashis receiver off its hook. With the second plug of the tone testcircuit the operator will then test the multiple jacks of the record-ing toll trunk lines, and upon finding one that is not in use, will insertthe plug into it. The second (red lamp) in the tone test circuit willalso remain tmlighted, but a lamp at the recording operators posi-tion associated with the rec
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
