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      Knowledge is Power

      Scientific American October 15, 1887

      On Red and Purple Chloride, Bromide, and Iodide of Silver; on Heliochromy and on the Latent Photographic Image

      • By M. Cary Lea on October 15, 1887

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      More in the October 15, 1887 issue of Scientific American
      • Experiments on the “Mechanical Equivalent of Heat” on a Large Scale
      • Practical Photography
      • The International Yacht Race
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