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      Knowledge is Power

      Scientific American April 1916

      Finding your Way at Night without a Compass

      An Accomplishment Necessary for the Soldier, Explorer or Traveler

      • By Lieut-Colonel W. A. Tilney on April 1, 1916

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      More in the April 1916 issue of Scientific American
      • Food Selection—I
      • Moving a Lighthouse
      • Turbine Blading
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