The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 566
arbon ones of the solid-back type, so constructed that they will carry a very heavycurrent without excessive heating. In one form used the heatgenerated was dissipated by constructing the carbon chamberwith two deep grooves so as to obtain a large air-cooling surface.In a later and more… … INDUCTANCE
Telephone
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