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      Knowledge is Power

      Scientific American September 07, 1918

      Modern Aeronautics—II

      A Review of Some Outstanding Problems

      • By W. F. Durand on September 7, 1918

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      More in the September 07, 1918 issue of Scientific American
      • Electricity Recovering from Electric Traction Lines
      • Pitch as a Fuel
      • The Gelation of the Natural Emulsoids
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