The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 441
(1) Attenuation and distortion of complex wave on 20-lb. cable line.800 ** and 3rd harmonic superimposed OmUta Wave of … (2) Attenuation and distortion of same wave over same line, but inductance of•2 henry per mile added Fig. 405 line. This is found to very much improve the results obtainedboth in volume and quality. Another and a simpler method of improving the terminalconditions is to fit step-up repeating coils…
Telephone
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