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      Scientific American May 1954

      The Amateur Scientist - May 1954

      About a hygrometer made from a flower pot, and huge telescopes with compound mirrors

      • By Albert G. Ingalls on May 1, 1954

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      More in the May 1954 issue of Scientific American
      • Are Wild Animals in Captivity Really Wild?
      • The Authors
      • Ultrasonics
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