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      Scientific American March 21, 1891

      Experimental Science- March 21, 1891

      • By Geo. M. Hopkins on March 21, 1891

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      More in the March 21, 1891 issue of Scientific American
      • A Safety Device for Inclined Roads
      • Business and Personal- March 21, 1891
      • Notes & Queries- March 21, 1891
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