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 66
Fio. 27.—Electrical connections of S.C. key. form of horseshoe electromagnet with the two coils con-nected in series and the ends of the wire joined to tM^o … Fii!. iS.—r.O. Siiiiii.Icr, JO .-inil .Km. brass terminals on the base. The necessary adjust-ments are: Jlie axle of the lever carrying the armature 56 ELEMENTARY TELEGRAPHY should be just fiee to move in the hollowed ends of thescreAv pivots which limit the sideway movement. Thetransverse screw…
Telegraph
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