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mounting screws
mounting screws

mounting screws

Date1750-1800
Inventory Number1998-1-1147
ClassificationTelescope Mount
Subject
    Maker English
    Cultural Region
      Dimensionseach screw: 3.6 × 2.3 × 1.3 cm (1 7/16 × 7/8 × 1/2 in.)
      Material
        DescriptionTwo brass thumbscrews with winged heads for attaching a small telescope tube to its mount. These are typical of those used in the 18th century on brass Gregorian and Cassegrain telescopes.
        Signedunsigned
        2-foot Gregorian reflecting telescope with split object glass micrometer
        2-foot Gregorian reflecting telescope with split object glass micrometer
        James Short
        Date: circa 1763
        Accessories: split object glass micrometer; spare secondary mirror in tin box (0002b).
        Object number: 0002
        Gregorian reflecting telescope
        Gregorian reflecting telescope
        English
        Date: 1715-1720
        Accessories: solar filter; lens; awl; dust caps.
        Object number: 5002
        Clark patent equatorial mount, no. 6, on tripod
        Clark patent equatorial mount, no. 6, on tripod
        Alvan Clark and Sons
        Date: 1910
        Object number: 2003-1-0077b
        0.25-inch refracting telescope
        0.25-inch refracting telescope
        English
        Date: 1790-1820
        Object number: DW0974
        mounting and tripod for 4-foot Gregorian reflecting telescope, 7-inch aperture
        mounting and tripod for 4-foot Gregorian reflecting telescope, 7-inch aperture
        Claude-Siméon Passemant
        Date: 1750-1769
        Object number: DWN0001b
        2-inch refracting telescope
        2-inch refracting telescope
        John Dollond (II)
        Date: 1780-1800
        Object number: DW0845
        2 ring mounts for finder telescopes
        2 ring mounts for finder telescopes
        American
        Date: 1850-1900
        Object number: 1998-1-1157
        mount for Gregorian reflecting telescope
        mount for Gregorian reflecting telescope
        James Short
        Date: 1743
        Object number: DWN0007b
        solar microscope fashioned from screw-barrel simple microscope
        solar microscope fashioned from screw-barrel simple microscope
        Edward Bromfield
        Date: circa 1745
        Accessories: storage box (1169b); accessories box (1169c)
        Object number: 1169a
        round knurled nut
        round knurled nut
        French
        Date: 1780-1840
        Object number: 2007-1-0190
        1-foot Gregorian reflecting telescope
        1-foot Gregorian reflecting telescope
        English
        Date: circa 1735
        Object number: 0054
        1-foot Cassegrain reflecting telescope
        1-foot Cassegrain reflecting telescope
        James Short
        Date: circa 1758
        Accessories: dust cap; object glass micrometer (0059)
        Object number: 0053