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      Scientific American April 03, 1909

      The Efficiency of Aerial Propellers

      A New Investigation and its Results

      • By W.R. Turnbull on April 3, 1909

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      More in the April 03, 1909 issue of Scientific American
      • Experimenting with Animals and Plants
      • A Noteworthy Anthropological Discovery
      • Extraction of Potash and Soda from Minerals
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