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Browsing by Author "Eldridge, W"

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    • Temporary mounting of an achromatic refracting telescope 

      Eldridge, W (Printed by Engelmann & Co., 1831)
      Engraving by W. Eldridge, of the temporary mounting of an achromatic refracting telescope belonging to Edward Joshua Cooper (1798-1863), it had a 14-inch object glass and a focal length of 25 feet.