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Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)

Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 151

An illustration from Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute, 1910, leaf 151
Pig. 117.—Aerial cable suspension fZ = Pw8 s 140 ELEMENTARY TELEGRAPHY possible xxnder the footAvay upon the roads at a depth oftwo feet. Flush boxes were provided at distances of 100yards or less apart. … Fii:. lis.—Game <;iianl. The form of cable now used for underground work isvariously termed dry core, air-sjDace, and paper;its efficiency depends upon the presence of dry airbetween the paper insulated wires. The conductors, whichare of the highest conductivitycopper wire, vary in gauge,…

Telegraph

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