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      Knowledge is Power

      Scientific American March 29, 1919

      Measuring Visible and Invisible Light, Air Screens for Furnace Workers

      • March 29, 1919

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      More in the March 29, 1919 issue of Scientific American
      • England's Aircraft Industry
      • Return of the 17-Year Locust
      • Hurley and the Shipping Situation, The Humanity of Poison Gas and more
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