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      Knowledge is Power

      Scientific American January 27, 1894

      Studies of the Phenomena of Simultaneous Contrast Color: And on a Photometer for Measuring the Intensities of Lights of Different Colors

      • By Alfred M. Mayer on January 27, 1894

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      More in the January 27, 1894 issue of Scientific American
      • The Pecten or Scallop
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