Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 304
^^. As a final example wemay state that the number of atoms in the universe, as far asthe nearest fixed star, can be shown to be certainly fewer than7 X io»^ Lesson XXVL—Electro7)iagnets. 323. Electromagnets.—In 1820, almost immedi-ately after Oerstedts discovery of the action of theelectiic… … Fig. II4* simple diagram of Fig. ii4j where a current from asingle cell is passed through a spiral coil of wire, in the CHAP, v.] KLLCTRICITY AND MAGNETISM. 287 hollow of which is placed a bar of iron or steely, which isthereby magnetised. The separate turns of the coilmust not touch one another or…
Electricity · Magnetism
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