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      Knowledge is Power

      Scientific American April 09, 1910

      Solar Vortices and Magnetic Fields.—II

      Recent Study of the Sun

      • By George E. Hale on April 9, 1910

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      More in the April 09, 1910 issue of Scientific American
      • Human Nature and Clothes
      • The Low Cost of Reinforced Concrete Chimneys
      • Curious Importations
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