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      Knowledge is Power

      Scientific American July 13, 1889

      The Wave Length of Light as a Practicable and a Feasible Standard of Length

      • By A. A. Michaelson, E. W. Morley on July 13, 1889

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      More in the July 13, 1889 issue of Scientific American
      • Bambangala
      • Electrical Smelting and Production of Aluminum
      • On Allotropic Forms of Silver
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