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    Cassegrain telescope

    Date
    ca. 1820
    Creator
    Thomas Crickmore (1781 - 1822, British) , Instrument maker
    Object type
    Archive reference number
    Material
    Subject
    Content object
    Description
    Cassegrain telescope facing right [as viewed] with brass fittings, mounted on a circular joint and a rectangular base. Base inscribed: '1900-131'.

    Used by Henry Kater FRS in his comparison of the merits of the Cassegrainian and Gregorian telescopes. This comparison is discussed at length in Kater's paper 'On the light of the Cassegrainian telescope, compared with that of the Gregorian', Philosophical Transactions of the Royal Society, vol 103, 1813. In it, he identifies the instrument maker as 'Thomas Crickmore of Ipswich' and describes the view it afforded of the planet Jupiter: 'a Cassegrainian telescope of one foot in length, and on vieweing Jupiter with it, with a power of about 100, I was instabtly struck with the brightness of the image[...]'

    Henry Kater (1777-1835) British geodesist and metrologist was elected a Fellow of the Royal Society in 1814.
    Related fellows
    Henry Kater (1777 - 1835, British) , Geodesist
    Associated place
    <The World>
       > Europe
          > United Kingdom
    Credit
    © The Royal Society
    Image number
    RS.8459
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