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      Knowledge is Power

      Scientific American May 21, 1904

      Color Photography and Dark-Room Illumination

      • By C. F. Townsend on May 21, 1904

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      More in the May 21, 1904 issue of Scientific American
      • Patents!
      • Soldering of Metals and the Preparation of Solders and Soldering Agents
      • The Nebulosity in the Region of γ Cygni
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