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      Knowledge is Power

      Scientific American December 1922

      Sleeve-Valve Engines for Motorcycles, Cleaning Wheat at the Thrashing Machine

      • December 1, 1922

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      More in the December 1922 issue of Scientific American
      • A Square Deal for the Psychics
      • Blasting a Channel Through a River's Rocky Bottom
      • Fog Signaling by Polarized Sound
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