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 186
nnected tothe split of the sounder coils and the front contactto earth. The normal resistance of the line path is there-fore 350 + 500 + 500 + 500, or 1850. Consequentlythere is a want of balance and the potential at A ishigher than at B. This causes a permanent current toflow through the… … OrO-^^^-r-^ PSJ^Soo Out Stn. Ckntral Stn. v Fiii. 14ii.—Theoretical diagraui of Hay C.B. dujilex. permanent line current are about equal and the necessityto bias the sounder is reduced to a minimum. When key dejyressedab out station, A to earth then becomes850, but B to earth is always 1250, so…
Telegraph
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