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      Knowledge is Power

      Scientific American March 07, 1914

      The Diver in Winter

      Sawing off a propeller blade under the ice of Toronto Bay

      • March 7, 1914

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      More in the March 07, 1914 issue of Scientific American
      • A Canadian Suspension Bridge, The Reddening of Leaves
      • How to Mount Diatoms
      • The Industrial Need of Technically Trained Men
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