A Coelostat.
Engraving of a Coelostat by Leon Foucault (1819-1868) a French physicist. A Coelostat is an instrument with a rotating mirror that continuously reflects the light from the same area of sky, used for monitoring the path of a celestial object. Dated 19th Century. (Photo by: Universal History Archive/ Universal Images Group via Getty Images)

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Credit:
Editorial #:
929246010
Collection:
Universal Images Group
Date created:
January 01, 1850
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Not released. More information
Source:
Universal Images Group Editorial
Object name:
917_05_WHA_097_0015
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4941 x 4245 px (16.47 x 14.15 in) - 300 dpi - 13 MB