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 86
tuline before - contact broken. … tlc. 03.—Cdiineclions of 0-terininftlreversing key. 8iMPF,K Switchi:s.There are three forms of two-way switclu>s in commonuse distinguished hy the nuinl)(-r of tfuMr terminals. TJje 76 ELEMENTARY TELEGRAPHY tliree-terniiiial switch is shown in Fig. 54. Owing to thegeneral use of the six-terminal…
Telegraph
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