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      Knowledge is Power

      Scientific American August 11, 1917

      Starving a Fire by Means of a Blockade of Steam, A New Permanent Magnet Steel, and more

      • August 11, 1917

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      More in the August 11, 1917 issue of Scientific American
      • Astronomy- August 11, 1917
      • Mount Wilson's 100-Inch Reflector
      • The Submarine Problem--XI
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