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      Knowledge is Power

      Scientific American March 26, 1892

      Optical Projection of Opaque Objects

      • By Geo. M. Hopkins on March 26, 1892

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      More in the March 26, 1892 issue of Scientific American
      • Artificial Oyster Culture in France
      • Gum Arabic and Gum Senegal
      • Open-Hearth Steel Castings
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