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      Celebrate Math Awareness Month

      Scientific American June 07, 1890

      The Rollet Process

      On the Rollet Process for Producing Purified Castings

      • By A. Rollet

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      More in the June 07, 1890 issue of Scientific American
      • Gymnastics for Girls
      • The Giant of Aquila
      • Increasing the Color of Logwood
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