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      Knowledge is Power

      Scientific American June 29, 1912

      A Modern Photometric Equipment

      The Measurement of Luminosity in the Technical Laboratory

      • June 29, 1912

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      More in the June 29, 1912 issue of Scientific American
      • Modern Dredǵers of the Bucket and Suction Type
      • The Physioloǵy of the Dinner Table
      • Modern uses of the Metal Aluminium
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