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      Scientific American November 02, 1912

      A Double-Field Microscope

      For the Direct Comparison of Two Objects

      • By W Th*amp*ouml;rner on November 2, 1912

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      More in the November 02, 1912 issue of Scientific American
      • The Corliss Engine
      • The Penetrating Radiation
      • Health Conditions in the Canal Zone
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