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      Scientific American August 30, 1919

      When the Compass Goes Crazy

      The Peculiar Conditions of Flying Which Make the Needle Misbehave

      • By C. H. Claudy on August 30, 1919

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      More in the August 30, 1919 issue of Scientific American
      • Modern Machine Design in Old China, Ventilation of the Vehicular Tunnel, and more
      • Recently Patented Inventions - August 30, 1919
      • The James Watt Centenary
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