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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 143

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 143
Fki. lOS.—a :i5-liuu wooden irulc, with .slay liltud on ouliiggci-.K 2 132 ELEMENTARY TELEGRAPHY … tlie pole at a pointw li e r e greatstrength is needed.The stresses tend toforce the stmt into,and lever the poleout of, the ground,and in order tocounteract this tend-ency stay blocks arefitted (as sho^\ni inFig. 109) near theends of the pole andstrut. The scarfedend of the strutshould be well…

Telegraph

Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.

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