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      Scientific American April 29, 1911

      One of the Dangers of Flight in a Wind, Secrecy in Modern Industries and more

      • April 29, 1911

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      More in the April 29, 1911 issue of Scientific American
      • Experiments on Light
      • Science in the Current Periodicals - April 29, 1911
      • A Painting in Glass on a Canvas of Concrete
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