| Show observatory OP OF PARIS the city of parts paris may well claim a position as one of the great scientific centers its university and kindred institutions having witnessed many of the developments of the sciences and the discoveries of modern times and aad particularly P so in the science of astronomy the observatory of paris being 7 THE GREAT REFLECTOR REFLECT OEL recognized as one of the centers of astronomical work its astronomers having from the commencement been associated with the history of the science the observatory has in tact seen the science of astronomy emerge from its primitive stage of two centuries ago into the remarkable condition of development which we find at the present day says the scientific american the foundation of the observatory dates adsit from the middle of the seventeenth century at which period the academic royale des sciences decided to create an establishment devoted to physical research and astro astronomical macal work the observatory lies on the southern side of the seine the great instrument with the staircase called the reflector was installed in it is completely by a metallic cupola not shown in the picture which slides upon a system of ralls rails the movable part weighs pounds the instrument is provided with a clock movement having a foucault Pou cault regulator the mirror deserves special mention the casting of the mirror was in trusted to the works of st and aad the mass of glass as delivered by the works weighed 1000 pounds which weight was reduced to nearly halt half by the optical work the diameter of the mirror la Is m and the focal distance m the mirror is generally reail re silvered vered every year |
