The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 119
ed of turningthe handle of the generator also varies greatly with differentpersons, so that the bell must be able to respond equally wellto varying speeds. An ordinary battery bell will only respondsatisfactorily to currents following each other at a certainrate, and will, therefore, not be…
Telephone
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