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      Knowledge is Power

      Scientific American October 1921

      Showing the Earth's Movement, New Cold Method of Making Porcelain, and more

      • October 1, 1921

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      More in the October 1921 issue of Scientific American
      • Needed--A New Army Uniform
      • The Heaven's in October, 1921
      • Artesian Reservoirs for Intermittent Supplies of Energy, The Illuminated Highway and more
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