Practical electricity, with questions and answers (1901)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 58
Figure 18 Floating helix and electromagnet. ^ 45 If now a piece of soft iron be placed in the helix allthe above actions become much stronger, but this is theonly dilference. A piece of hard steel may be made into apermanent magnet by being inserted into a helix carryingcurrent. A helix with a… … Figure 19 Magnetic spectrum of a helix; compare with spectrum of bar magnet. ^7=^ Figure 20 Wire carrying current in a magnetic field tending to move in or out of the magnet. >^ 46 Fig. 20 sliovvs a liorse-shoc magnet and in such a mag-net the most powerful field exists between the ends. Fig.20…
Electricity · Electric generators
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