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      Knowledge is Power

      Scientific American July 25, 1891

      A Clock for Pointing out the Direction of the Earth's Orbital Motion in the Ether

      • July 25, 1891

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      More in the July 25, 1891 issue of Scientific American
      • A Novel Method for the Production of Sodium and Potassium Nitrite
      • Compressibility of Hot Water and its Solvent Action on Glass
      • Identification of More Ancient Cities of the Pharaohs
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