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      Knowledge is Power

      Scientific American July 02, 1881

      Traction of Locomotives—Rule for Calculating

      To the Editor of the National Car-Builder

      • July 2, 1881

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      More in the July 02, 1881 issue of Scientific American
      • The House Wren as an Insect Destroyer
      • Torpedo Practice–Jumping a Boom
      • A Sulphureted Hydrogen Apparatus
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