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      Knowledge is Power

      Scientific American February 23, 1878

      Sadlier's New Method of Raising and Lowering Screw Propellers

      • February 23, 1878

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      More in the February 23, 1878 issue of Scientific American
      • Business and Personal
      • Liquefaction of Gases-Cailletet's Experiments
      • Vanier's Improved Brick Machine
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