Engraving of a Coelostat by Léon 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

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

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