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      Scientific American January 16, 1915

      Recent Advances in Photography

      Some Effects Produced on Sensitive Plates by Material Emanations

      • By Henry Leffmann on January 16, 1915

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      More in the January 16, 1915 issue of Scientific American
      • Apparatus for Demonstrating Newton's Laws
      • Forest Fire Prevention
      • Sudden Changes in the Form of Liquid Crystals
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