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      Knowledge is Power

      Scientific American April 24, 1886

      Metallic Defenses of the Steel Works of the United States

      • April 24, 1886

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      More in the April 24, 1886 issue of Scientific American
      • Application of Electricity to the Study of Spontaneous Motion in Capillary Tubes
      • Hilder and Scott's Metal Sorting Machine
      • Radii of Curvature Geometrically Determined
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