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      Knowledge is Power

      Scientific American December 1927

      The Scientific American Digest, December 1927

      A Review of the Newest Developments in Science, Industry and Engineering

      • By Albert G. Ingalls on December 1, 1927

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      More in the December 1927 issue of Scientific American
      • Index to Volume 137-July-December, 1927
      • Lightning Prevention
      • Strays from the Ether, December 1927
      View Full Contents
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