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      Scientific American October 07, 1911

      Why the Earth Appears Concave

      An Optical Illusion Observed from Balloons

      • By Charles Forbes on October 7, 1911

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      More in the October 07, 1911 issue of Scientific American
      • Prizes for Catchinǵ Flies
      • The Great Star Map—VI
      • A New Multi-Spindle Drill
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