Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 35
middle of the magnet is thus accounted for. 24. Making Magnetic Fields.—Lay a bar magnet flaton a table and cover it with a sheet of cardboard. Obtainsome sifted iron filings from which the dust has been re-moved and enclose them in a pepper-box or piece of gauzenetting. Sift the filings over the… … Fig 24.—Coating Paper with ParaffinWax. MAGNETIC FIELDS. 17 representation of the magnetic field surrounding the magnet,as in Figs. 25 and 26. When it is desired to make a perma-
Electricity · Magnetism
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