Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 35
by pouring overthem a weak solution of gum, by which each filing is held inits place; or by a solution of potassium cyanide, which causesunder each iron filament a deposit of Prussian blue. Forthis purpose the paper should be laid on a sheet of glass. We may experiment with a single pole for… … Fig. 16. In an ordinary bar magnet, laid horizontally under the paper,the lines of force emanate chiefly from the poles (Fig. 17),forming oval curves between them. Theoretically, in a simplebar magnet we should expect all the lines of force to gofrom one pole to the other, but in an ordinary magnet…
Electricity
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