Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)
United States. Bureau of the Census, Steuart, William Mott, 1861-, Martin, Thomas Commerford, 1856-1924, Abbott, Arthur Vaughan, 1854-, Mayer, William · Washington : Govt. Print. Off. · leaf 160
Deep-sea Cable (tor lesser depth). … Intermediate Cable, TYPES OF SUBMARINE CABLES. 18407—06 9 118 TELEPHONES AND TELEGRAPHS. layer of insulation consisting usually of gutta-perchaor a gutta-percha compound. These constitute thecable proper, but are protected by a wrapping of juteor hemp, around which is placed an external sheathingof…
Telephone · Telegraph · Fire alarms
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