The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 260
oom 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> c.w ^3_ 12 Pane.1 Dummy 15 21 23,C.W. I ^Junction Relay Rock Fig. 251 chief operators, and the switch-room managers desks. Themonitors have the… … I CM 234 PRACTICAL TELEPHONE HANDBOOK A general view of the switch-room is given in Fig. 252, as
Telephone
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