A photograph from 1897 of the 40-inch ( m) refractor telescope, at Yerkes Observatory, in Williams Bay, Wisconsin, the largest achromatic refractor ever put into practical astronomical use. Founded in 1892 by Charles Tyson Yerkes, the institution belo

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A photograph from 1897 of the 40-inch ( m) refractor telescope, at Yerkes Observatory, in Williams Bay, Wisconsin, the largest achromatic refractor ever put into practical astronomical use. Founded in 1892 by Charles Tyson Yerkes, the institution belongs to the University of Chicago.

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Size: 2987px × 3577px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 1800s, 1897, 19th, 40, 40-, achromatic, america, american, astronomical, astronomy, bw, century, historic, historical, history, largest, observatory, refractor, science, states, telescope, united, usa, wisconsin, yerkes