. Electrical world. be operated wlien either lamii is lighted. .\il supervisory and linerelays are capable of being operated by a telephone through 1,200ohms line resistance and can withstand twice the normal pressure ofI he battery without sticking. All circuits are strictly metallic and perfectly balanced under alloperating conditions and arranged so as to produce no cross-talkingor other inductive disturbances. In the center of the main operatingroom, which measures 90x40 ft., arelhe desks of the chief operator,the trouble and information clerks, and all within full view of theentire board.
. Electrical world. be operated wlien either lamii is lighted. .\il supervisory and linerelays are capable of being operated by a telephone through 1,200ohms line resistance and can withstand twice the normal pressure ofI he battery without sticking. All circuits are strictly metallic and perfectly balanced under alloperating conditions and arranged so as to produce no cross-talkingor other inductive disturbances. In the center of the main operatingroom, which measures 90x40 ft., arelhe desks of the chief operator,the trouble and information clerks, and all within full view of theentire board. To the one side of the operating room toward the front of thebuilding is the emergency hospital, equipped with all modern med-ical appliances for the temporary treatment of operators who may. FIG. 7.—E.\ST I)R.\NCH EXCH.^NGE. operates in circuit with the line lamp relay and remains lighted untilthe call is answered. The other lamp is provided with a red jeweland operates in circuit with the answering supervisory relay, and 111,. S.—.\1.\IN ROOM, EAST BRANCH EXCHANGE. be taken ill suddenly. To the other side is the operators rest room,which is comfortably furnished and greatly relished by the operatorsduring the two periods of rest of half an hours duration. A well-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
