The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 442
requiring much con-sideration, as it is necessary that as little as possible of theenergy of the waves shall be dissipated by the formation ofFoucault or eddy currents, and if iron cores be used, byhysteresis losses. To keep the coils within reasonable size,it is necessary to use iron cores. Prof.…
Telephone
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