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      Scientific American February 1941

      Telescoptics, February 1941

      A Monthly Department for the Amateur Telescope Maker

      • By Albert G. Ingalls

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      More in the February 1941 issue of Scientific American
      • 50 Years Ago, February 1941
      • Extruded Metals, Bearing Checker, and more
      • Industrial Trends, February 1941
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