Gilley, Frank M · Boston, Allyn & Bacon · leaf 514
Fig 468 I lines of force with iron filings. Remove the field magnet, and re-place the armature. Connect the brushes with a battery or handdynamo, and send a current through the armature. Mount a cardover the armature, just out of contact with it. Sprinkle on ironfilings. Study the lines of force of…
Physics
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