Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 60
ix? We have seen (Sec. 4 Chapter IV) that the helix itself pos-sesses the properties of a magnet, having polarity and thepower of repulsion as well as attraction. 2. What is now proposed? We are now with the galvanometer, to compare the helixand magnet still further and identify their… … Currents from a Magnet. Let a helix, with or with-out a soft iron core, have itsterminal wires screwed intothe binding posts of a galva-nometer. Next let one poleof a steel magnet move toand from the end of the he-lix as in Fig. 27. Duringthis motion the needle of thegalvanometer will vibrate. 5.…
Telegraph
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