The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 594
y-wound repeaters are used in 565 MISCELLANEOUS APPLICATIONS place of the resistance. The connection to the auxiliarycircuit is then due to induction through the repeaters. Thefigure shows three circuits connected to branching-jacks, thecentre jacks being for the auxiliary circuit. In another… … Fig. 511.—Combined Telegraphy and Telephony. Van Ryselberghes System multiplex telephony work quite independently of each other,so long as they are properly balanced, and any or all of themmay be used either for telegraphic or telephonic purposes.The process of signalling which is referred to above…
Telephone
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