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 57
^ that a compass is. Ifthere were two of them floating inthe same vat they would arrangethemselves end to end with N. andS. poles adjacent. Fig. 18 shows a zinc and copperplate attached to a cork and floatingThe zinc and … 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…
Electricity · Electric generators
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