American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 641
ND HARBOR CABLES.—As a rulc, but ouc conductor is used in long oceancables, as, for exami3le. in the case of the Atlantic cables. Gutta-))ercha is chieflyused as the insulating material. The conductor of such cables is of the purestcopper obtainable and is generally composed of 7 copper wires. Tlie…
Telegraph
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