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      Knowledge is Power

      Scientific American August 14, 1886

      The Formation and Fixation of Magnetic Curves

      • By Geo. M. Hopkins on August 14, 1886

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      More in the August 14, 1886 issue of Scientific American
      • A Wrench with Lift Cams
      • Disintegration of Cast Iron by Coal Gas Flame
      • Index of Inventions - August 14, 1886
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