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  CPYRGHT
  Yerkes Observatory, on the shore of Lake Geneva,
  / /
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  Wis.
  Approved For Release 2001/03/07 : CIA-RDP96-00789RO01 200060011 -1
  University of Chicago

       Approved For Release 2001103/07 : CIA-RDP96-00789ROP1200060011-1
       site 761
       Yerkes Observatory
           The astronomical observatory
       of the University of Chicago, at Williams Bay, Wisconsin on
       Lake Geneva. It is the university's principal center for
       research and graduate instruction in astronomy and astrophysics.
       The observatory was founded in 1892 when Charles Tyson Yerkes
       (q.v.) presented the university with funds sufficient for the
       building and equipment. The major instrument is a refracting
       teles-coPe,--@@ompleted in 1897, with an aperture of 40 inches and
       a r6c'-'al length of 62 feet; this is the worlds largest
       refractor. In addition, there are two reflecting telescopes
       with apertures of 24 inches, and a number of small instruments
       designed especially for photographic and spectroscopic studies
       of such atmospheric phenomena as the aurora borealis. Since
       1932 the University of Chicago has cooperated with the
       University of Texas in the operation of the latter's McDonald
       Observatory at Fort Davis, Texas.
                 observational programs
       conducted with the telescopes at the Yerkes observatory and
       with the 36-inch and 82 inch reflecting telescopes at the
       McDonald Observatory make use of a variety of photographic,
       photometric, and spectroscopic techniques. These studies,
       largely astrophysical, include investigations of the physical
       properties of stars observed singly and in clusters, the
       structure of our galaxy, and the structure and dynamics of
       other galaxies. There are other programs for the observation
       of double stars, planets, comets, asteroids and the aurora.
       The Yerkes Observatory is also a leading center for theoretical
       work in astrophysics.
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