University of Chicago's Yerkes Observatory

Rolf Riekher, 86, a former German optical lens engineer, examines the large gear sets of the Yerkes Observatory telescope at the University of Chicago's Yerkes Observatory 40" diameter telescope, in Williams Bay, Wis., April 23, 2008.
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( Chicago Tribune photo by David Trotman-Wilkins / April 23, 2008 )

Rolf Riekher, 86, a former German optical lens engineer, examines the large gear sets of the Yerkes Observatory telescope at the University of Chicago's Yerkes Observatory 40" diameter telescope, in Williams Bay, Wis., April 23, 2008.

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