. Electrical world. ed for the operation of the exchange and are of suflScient capacityto operate the plant without recharging for 48 hours. Each set ofbatteries consists of 20 cells and the plates in each cell are placed inlead-lined tanks of such size that additional plates can be added until there are a sufficient number to operate the ultimate capacityof the exchange for 36 hours without recharging the cells. In close proximity to the power plant is the desk of the wirechief. It is arranged for two positions and each position is equippedwith 10 complete cord circuits with listening and rin
. Electrical world. ed for the operation of the exchange and are of suflScient capacityto operate the plant without recharging for 48 hours. Each set ofbatteries consists of 20 cells and the plates in each cell are placed inlead-lined tanks of such size that additional plates can be added until there are a sufficient number to operate the ultimate capacityof the exchange for 36 hours without recharging the cells. In close proximity to the power plant is the desk of the wirechief. It is arranged for two positions and each position is equippedwith 10 complete cord circuits with listening and ringing keys and10 order wire keys. Space is provided in each position for an ulti-mate capacity of 40 line lamps and jacks, the present equipment beingfor 30 lines, operating automatically on lines leading, one to themonitors and chief operators desk, one to the trouble clerk and sixto the strip of multiple jacks in the main board. Five jacks terminatein cords and plugs in the keyboard of what is known as the eleventh. FIG. 5.—U)NG-DIST.\NCE ). EXCH.\NCE. and twelfth positions, two in cords and plugs at one of the trunkingpositions in branch exchange A, two in B and two similarly inbranch C. There are five two-way leads which lead to the distrib-uting frames in the various exchanges. All lines are duplicatedin tiie two positions, so that they may be answered or tests madefrom either or both positions. A double-scale Weston voltmeteris situated between the two positions. All circuits are so arrangedand designed that by manipulating the keys all required tests foropens, grounds, reserves, shorts and all other trouble, both on theline and on the switchboard, can be made from this desk. The deskis also equipped with a key and special apparatus for signalling asubscriber when his receiver is left off the hook. A large numberof pigeon-holes for trouble tickets are also provided. In a roomadjoining the one described above the long-distance switchboardis located. This b
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
