History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 197
ited therein. This exterior iron envelope inearly cables was covered with a thin layer of zinc, — galvanized,as it is called, to jjrevent oxidation. But experience has shownthat this erelong disappears, and that the chemical action of sea-water upon the iron protecting wires is not at all rapid.… … Fig. 74 represents a variety of insulated copper wire designedfor office connections,—partly covered with gutta-percha and partlywith a double coating of cotton, and twice coated with hot shellacvarnish. THE ATLANTIC CABLE. 179 CHAPTER XIV. THE ATLANTIC CABLE. The other and still more marvellous…
Telegraph
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