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      Knowledge is Power

      Scientific American February 25, 1911

      A Home-made Portrait Attachment for a Camera of Fixed Focus

      • By Albert S. Getten on February 25, 1911

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      More in the February 25, 1911 issue of Scientific American
      • Construction of a Four-and-a-Half-Inch Reflector
      • Graphic Demonstration of Cometary Orbits
      • Observations Among the Workshops of Europe--I
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