. The practical telephone handbook and guide to the telephonic exchange . the operators attention to an instruction to be givenby one of the supervisory officers to one or more of the the green lamps on the switch-board glow simultaneously,and each of the operators thereupon presses a special order-wire key, and listens to the instruction. The left-hand lampis a red one, and is called the special order-wire is intended to call attention to the fact that a special chargeis to be made for the call. It glows only when an order-wirekey is pressed which connects to a central o
. The practical telephone handbook and guide to the telephonic exchange . the operators attention to an instruction to be givenby one of the supervisory officers to one or more of the the green lamps on the switch-board glow simultaneously,and each of the operators thereupon presses a special order-wire key, and listens to the instruction. The left-hand lampis a red one, and is called the special order-wire is intended to call attention to the fact that a special chargeis to be made for the call. It glows only when an order-wirekey is pressed which connects to a central office situated outof the ordinary territory, and for which an extra fee is exacted. Fig. 251 is a detailed plan of the Barnsbury switch-room,showing the positions of the various subscriber and junctionsections, operators positions, etc. The operators positions 232 PRACTICAL TELEPHONE HANDBOOK are all numbered, and it will be noticed that all the UApositions have even numbers and all the B positions oddnumbers. The positions are also shown of the monitors, the r. ane! Dummy Operators Service-Meter Cab/net Swibchroom MunaqersDesk * I 3 SS 2 S 3 o CD I tr Monitors Desk Radio tor Chief Operators-~~.. Desk & 2fSg Junction Boards 3 II13 15 1113 11 23 c. w. c. w> ^3_ 12 Dummy 15 21 23, I ^Junction Relay Rock Fig. 251 chief operators, and the switch-room managers desks. Themonitors have the means of plugging into circuit with any ofthe operators instruments, so that they can check any slack-ness or unnecessary talking on the part of the operators. COMMON BATTERY MULTIPLE SWITCH-BOARDS 233
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
