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 188
vantages over the Hay system—the work-ing from the head office is on the double current system ;it is satisfactory with a large amount of line leakage; andit lends itself to an extraordinary degree for the require-ments of concentration or the emergency of Wheatstoneworking. The principle of… … Fk:. 101.—Skeleton connections of Vyle and Smarts C.B. Duplex. (6) and / f.standard relay at out stations should be crossed. reversing key. At the out station a 8.C. galvanometer,S.C. key, and standard relay B (lOO + 100 ) are joinedin series with a fixed resistance of 4000 connected lietweenthe…
Telegraph
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