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      Knowledge is Power

      Scientific American May 23, 1885

      Instrument for Drawing Ellipses and Hyperbolas

      • By Frederic R. Honey on May 23, 1885

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      More in the May 23, 1885 issue of Scientific American
      • Aerial Navigation
      • The Possible Suspension of Old Age
      • Aluminum and its Extraction on a Commercial Basis
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