Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 36
Fig. 25.—Making :Magnetic Field of a Bar Magnet. nent record of the magnetic field, a piece of paraffin-coatedpaper is used in place of the cardboard. After the field is … Fig. 26-—Magnetic Field Between Unlike Poles. 18 PRACTICAL ELECTRICITY. produced, the flame of a Bunsen burner is gently applied,heating the paraffin, which upon cooling fixes the iron fil- 1 * I i / , f -Z :li > . .-..Trrj . 151 ^ M&griptje\A¥ii .^^ s • ifg? / / / : \ \ \^ \, ^^., ^--^- y y…
Electricity · Magnetism
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