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 94
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 … Flo. 63.—Polaiiztd double suiiiider. G 2 Bi ELEMENTARY TELEGRAPHY
Telegraph
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