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 30
i-al is woimd on a bar of softiron the lines of force are nearly all concentrated throughthe iron, which thus becomes a temporary magnet. Aspreviously mentioned such a combination is called an BLEGTROMA GNETS 19 electroiiiagiut and its polarity depends upon the directionin which the coil is wound.… … YOKE Fio. 3.—Electromagnet. magnet. Fig. 3 shows the connnon horseshoe form, the cores standing upon a connecting bar of iron, and the armature is fitted across both the cores in the same manner as the heei^er of permanent magnets. The wire in the coils must be connected so that the windings Avould…
Telegraph
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