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      Knowledge is Power

      Scientific American May 29, 1915

      A Mercury-Vapor Engine

      Increasing the Efficiency of a Heat Engine by Employing a Liquid of High Boiling Point

      • May 29, 1915

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      More in the May 29, 1915 issue of Scientific American
      • Measuring the Twisting Strength of Steel, Model of the Typhus Carrier and more
      • When Electricity Was Really in its Infancy, What Sank the "Lusitania"? and more
      • Recently Patented Inventions - May 29, 1915
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