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      Scientific American January 19, 1918

      Varying Position of the Observer of the Heavens

      Notes to Assist him to Realize the Direction he May be Looking

      • By Frederic R. Honey on January 19, 1918

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      More in the January 19, 1918 issue of Scientific American
      • Acid Economy in Metal Industries
      • Hardness of Metals
      • Recognition among Insects
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