Snow, Benjamin Warner, 1860- · Madison, Wis. · leaf 449
ace upon thesun. The twenty-eight-day period of magnetic changes coin-cides with the time of rotation of the sun upon its axis, and theeleven-year period is the same as the eleven-year period of therecurrence of sun spots. Magnetic storms invariably occur afteran unusual outburst upon the sun, or… … Fig. 24G. The Antarctic auroral curtain—By permission of tlie Royal Society. CHAPTER XXXI. DIAMAGNETISM. 377. Diamagnetism. xVs regards their magnetic proi)erties,all substances may be divided into two classes. Bodies like iron,nickel, cobalt, chromium, and many others, which are attractedby a…
Physics
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