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dark blue filter
dark blue filter

dark blue filter

Date1875-1900
Inventory Number2007-1-0489
ClassificationFilter
Subject
    Maker American ?
    Maker French ?
    Cultural Region
      Dimensions2.7 × 9.7 × 9.7 cm (1 1/16 × 3 13/16 × 3 13/16 in.)
      Material
        DescriptionDark blue, glass filter, just under 2 1/2 inches in aperture, is held in a blackened d brass frame at the front of a brass collar. The rim is knurled. The interior of the filter collar is painted matte black.
        Signedunsigned
        Curatorial RemarksThis dark blue filter has a smaller diameter than the violet filter, 2007-1-0488, but is otherwise similar in construction.
        dark violet filter
        dark violet filter
        American
        Date: 1875-1900
        Object number: 2007-1-0488
        aperture stop with blue filter
        aperture stop with blue filter
        Louis Jules Duboscq
        Date: 1850-1870
        Object number: 2007-1-0478
        mounted dark filter
        mounted dark filter
        American
        Date: mid 20th Century
        Object number: 2004-1-0395
        filter set for blue-light fluorescence
        filter set for blue-light fluorescence
        Wild Heerbrugg Ltd.
        Date: circa 1960
        Accessories: case
        Object number: 1997-1-2170
        3 neutral density filters for telescope eyepiece
        3 neutral density filters for telescope eyepiece
        English
        Date: 1850-1900
        Object number: 1998-1-1828
        Image Not Available for 2 filters
        2 filters
        French
        Date: 1875-1925
        Object number: 2007-1-0343
        set of 6 colored glass filters
        set of 6 colored glass filters
        French
        Date: 1860-1900
        Object number: 1998-1-0468
        box of accessories for Bromfield's solar microscope
        box of accessories for Bromfield's solar microscope
        English
        Date: circa 1745
        Object number: 1169c
        blue filters
        blue filters
        American
        Date: mid 20th Century
        Object number: 2007-1-0312
        6-inch refracting telescope
        6-inch refracting telescope
        Alvan Clark and Sons
        Date: 1910
        Accessories: shipping crate, terrestrial eyepiece, dust cap, mount and tripod (2003-1-0077b)
        Object number: 2003-1-0077a
        dark neutral-density filter
        dark neutral-density filter
        Edmund Salvage Company
        Date: 1942-1950
        Object number: 2006-1-0044
        Beck Small Best binocular compound microscope case and accessories
        Beck Small Best binocular compound microscope case and accessories
        R. & J. Beck
        Date: 1876
        Accessories: Beck patent substage condenser (1122c); apertometer (1122d)
        Object number: 1122b