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The practical telephone handbook and guide to the telephonic exchange (1906)

Poole, Joseph · New York, Macmillan Co. · leaf 162

An illustration from The practical telephone handbook and guide to the telephonic exchange, 1906, leaf 162 — Fig. 152.—Connections for Exchange and Extension Instrument—with Secrecy It will be noticed that only one condenser and one inductioncoil is used for the three instruments. Fig. 151a gives the connections of an arrangement for thesame purpose in which each instrument is provided with its … Fig. 152a.—Single Extension with 2 Exchange Lines—with Secrecy own induction coil and condenser, this being preferable incertain cases. Secrecy Arrangement.—If secrecy is desired, the arrangementshown in Fig. 152 is adopted when the extension and main instruments are in the same building. A push…

Telephone

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