Equatorial refracting telescope, Paris Observatory, France, 1884.
© Science Museum / Science & Society Picture Library
Photograph of one the telescopes at the Paris Observatory in France taken around 1884. This view shows the shows an equatorially mounted refracting telescope of 31 cm (12.8 inch) aperture made by the French maker Lerebours. The telescope was installed in 1860 within the western dome of the main building at the Paris Observatory.