The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 183
Fig. 180 Scale \ Fig. 181 than that of a tinsel conductor, the inner or tip conductorhaving a resistance of about 1*22 ohms per foot of cord, themiddle or ring conductor about 145 ohms per foot,and the outer or sleeve conductor having about 186 ohmsper foot of cord. Tinsel cords for common battery…
Telephone
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