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    Image
    Category
    Object type
    Maker
    Place of origin
    Date

    Micrometer achromatic refracting telescope with lens cap

    1825-1835

    Slit-lens, double image micrometer telescope H.O.4, in mahogany case with two brass keys and a reading lens, one key clamps to end of rod for separating the half lenses, telescope 2' 7 1/8" long when closed, diam. 2 11/ 16" at each end, leather covered draw tube engraved No. 32 Micrometre Lugeol par Colombi brevete Brest, silvered carriers at O.G. end "GGB No.32, Brest 1851, scales on silver nod 0 to 5 each way subdivided to 12 parts, 30 verniers

    Slit-lens, double image micrometer telescope H.O.4

    1851-1860

    Micrometer telescope, Rochon type, with box, by Thomas Jones, 62 Charing Cross, London, England, c. 1830

    Micrometer telescope

    1840-1860

    Micrometer telescope by T. Jones (Rochon type)

    Micrometer telescope by T. Jones (Rochon type)

    Rochon micrometrical telescope by Lenoir, early 19th century. A refracting telescope fitted with a sliding rock crystal (calcite) calibrated for angular measurements 0-36 arcminutes.

    Rochon micrometrical telescope by Lenoir

    1801-1832

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    National Railway Museum
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    Science and Industry Museum
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    Science and Innovation Park
    Science Museum
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