The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 301
lternating generator or interruptedbattery is connected on to the proper leg of the line to operatethe bell of the required station. Alternating current cannot be used for ringing on these lines,as both bells on the leg would be rung; and condensers cannotbe used in the bell circuits (as in the…
Telephone
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