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      Knowledge is Power

      Scientific American December 15, 1917

      Black Photographic Images Produced by Kathode Ray

      • December 15, 1917

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      More in the December 15, 1917 issue of Scientific American
      • Catalytic Decomposition of Benzoyl Chloride
      • How the Sun, Earth and Moon Move
      • Pruning Fruit Tree Roots
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