. Electrical world. 20 desk lines,also 150 incoming trunk lines and 16 desk trunks. Provision hasbeen made in the construction of the board for an ultimate capacit\of 12,000 lines, 360 outgoing trunks and 20 desk lines in each sec-tion, and 140 answering jacks and lamps in each position. Each ofthe local, trunk and desk lines is multiplied throughout every sec-tion. Each position is equipped with 15 complete cord circuits withlistening and ringing keys, supervisory and pilot lamps and a bankof ten order keys. The framework of the switchboard is built of structural iron. Theexposed cabinet work
. Electrical world. 20 desk lines,also 150 incoming trunk lines and 16 desk trunks. Provision hasbeen made in the construction of the board for an ultimate capacit\of 12,000 lines, 360 outgoing trunks and 20 desk lines in each sec-tion, and 140 answering jacks and lamps in each position. Each ofthe local, trunk and desk lines is multiplied throughout every sec-tion. Each position is equipped with 15 complete cord circuits withlistening and ringing keys, supervisory and pilot lamps and a bankof ten order keys. The framework of the switchboard is built of structural iron. Theexposed cabinet work, including all cable boxing in the exchangeroom, is made of selected mahogany. The rear of the board is en-closed with hardwood doors, which are readily removable. Eachoperators position is provided with two pilot lamps, with jeweled AruiL ,^0, 11)0-4 • ELECTRICAL WORLD and ENGINEER. 803 ¥ inijuntcd directly behind the cords and pkigs, and just below tlu-k-ering jacks. One lamp is provided with a white jewel and. 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
