A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 456
rth, is not at thegeographic north pole. Somewhere in the far south is acorresponding south magnetic pole, where the south-seekingend of the magnet would point straight downward. The following experiment shows that the earth has thepower of magnetizing iron. The earth is, in fact, a mag-net, and… … FIG. 237. 432 HH although various theories to account for its condition havebeen proposed. EXPERIMENT. Hold a bar of very soft iron, 7 (Fig. 238), about 50 cm. long, ina vertical position, and move the upper end of it slowly toward theside of a delicately pivoted magnetic needle, M, noting the…
Physics
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