The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 451
rton compound, and then formed round a core and made cylindrical with tarred hemp. Over this is a layer of ozokerited cotton tape, on which is wound brass tape, as protection against the teredo, a submarine animal. Over this is ozokerited cotton tape, then tanned Russian hemp, over which is wound… … Fig. 411.—Section of Anglo-BelgianGable (Full size) SUBMARINE TELEPHONE CABLES 423 0*275 microfarad per mile, and the insulation resistance not lessthan 500 megohms. The total resistance of each conductorat 485° F. was found to be 3314 ohms, and the capacity toearth 12*617 microfarads. For the…
Telephone
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