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 93
the right indicates dashes. The totalresistance of the sounders, which have 420 shunts, is 20each; one is connected to the terminals Df7 on the relay,and the other to (7>) and (IJ); that is, between the relaycoils joined in parallel. Current required 14 to 17 m.a.The connecting strap of tiie two… … trated in Fig. 63. Resistance between the terminals is430, working current 10 m.a. The apparatus works per-fectly in the line circuit, without relay or local battery, andis consequently admirably adapted for railway systems. TELEGUA FH WSTR UMENT8 83
Telegraph
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