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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 152

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 152
-. The paper used for pairs isdistinguished by various colours, which mav be red, white, Zl Fio. 119.—The numberingof telegrajili lines. TELEGRAPH LINES 141 blue, or green, and there is also a colour difference in thecotton thread which is wound to keep the paper in position.The wire bound with the… … Fir:. 120.—A full-sized sectiuu of a couiiMi.sitt; teligraiih ami telciilnMic caltio iiiaiieby tlie British Insulated & Helsb.v Cables. Ci)n.sideralilc ((Uantities of this cable are inuse by tlic Hrilish Post Office on their nndergronnd routes. The cable illustralcd con-tains jiairs of 100 lb.…

Telegraph

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