The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 512
XCHANGES 483 shown in this diagram but they are actually connected on the B section as shown in Fig. 451 in connection with thetrunk junction lines. B. I. Co.5 Radial-Arm Transmitter Instruments.—Figs. 453and 454 show two forms of C.B. wall instruments made by theBritish Insulated Co. which differ… … ,,,,,^-J^ Fig. 452.—Explanatory Diagram of Two-Way Junction Circuit{Reproduced from Electrical Engineering oy permission of the Proprietors) fitted on a radial arm which can be swung round so as toaccommodate to the different heights of the persons using it.C.B. Combination Table and…
Telephone
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