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 187
is higher than A, as already explained, thereforethe preponderating current through the relay coils pro-tluces marking. The polarized sounder responds to theeffect produced by the line current, altli(jugh it onlytraverses one ■winding, because the magnetization pro-duced is equivalent to that of 40… … E ^ Fiii. 100.—Connections of Hay C.B. chplex (line + x = 350*). a single current key the out station produces the effectof a double current on the relay at the head office; thatthe action of the receiving instrument at either office isindependent of the movements of the key at that station,and…
Telegraph
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