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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 185

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 185
ions apjDaratus,but the reduction ofthe feed resistanceto 800^ permits acurrent of about 60m.a. when the keyis down at the in-termediate station,and 43 m.a. at theterminal office. In this omnibussystem the internalresistance of thebattery plays a mostimportant part, andtherefore secondarycells are… … KiG. 14S.—C.C omnibus ciicuit Head office upecialnet with polarized relajing sounder 500^ + 500allowing great length and leakage. The Hav Cextral Battery Duplex. Several forms of duplex have been introduced with C. B.working, but Avith only partial success until Mr. C. E. Hay,of the…

Telegraph

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