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 76
LINE ^1 LOCAL CIRCUIT Fig. 37. A diagrammatic v of the construction of the PostOffice standard rela is sliown in Fig. 38. The cores of … Fic. 3S.—P.O. Staiiilaid ivlay. the two electromagnets are pohari/(Ml hy a liorseshoe per-manent magnet which for coinciiiciico is bent roiiml the 66 ELEMENTARY TELEGBAPHY left-hand bobbin. Ilie A^ ]Dole of the magnet is the lowerone, and near the poles, fixed on a Aertical brass spindlecarrying…
Telegraph
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