Skip to main content
Advanced Search
4.5-inch telescope objective
4.5-inch telescope objective

4.5-inch telescope objective

Datecirca 1900
Inventory Number1996-1-0481o
ClassificationTelescope Objective
Subject
    Maker Bausch & Lomb Optical Company 1853-present
    Maker Harvard College Observatory founded 1839
    Cultural Region
      Place of Use
        Dimensionscell: 15.2 × 15.2 × 3 cm (6 × 6 × 1 3/16 in.)
        Material
          Description1996-1-0481o is a telescope objective in a cell. The objective appears to be a doublet with a clear aperture of 4 1/2 inches. The cell is made of brass with a darkened front bevel and knurled rim. This is threaded into a sleeve of aluminum. The inside back edge of the cell is lined with cork.

          The focal length is
          Signedon cell: BAUSCH & LOMB OPTICAL CO.
          ProvenanceHarvard College Observatory, Agassiz Station; transfer to CHSI in 1969.
          Historical AttributesThis optical element was used by Harvard College Observatory and came from Agassiz Station.
          5.5-inch telescope objective with correcting doublet lens for astrograph
          5.5-inch telescope objective with correcting doublet lens for astrograph
          American
          Date: 1900-1930
          Object number: 1997-1-0083
          5-inch telescope objective with correcting doublet lens for astrograph
          5-inch telescope objective with correcting doublet lens for astrograph
          American
          Date: 1900-1930
          Object number: 1997-1-0084
          9.5-inch telescope objective for finder to 60-inch reflecting telescope
          9.5-inch telescope objective for finder to 60-inch reflecting telescope
          Andrew A. Common
          Date: circa 1889
          Accessories: box
          Object number: 1997-1-0037
          Crown lens (left) and flint lens (right). Elements for f/135 telescope objective by Alvan Clar…
          12-inch, f/135 doublet objective lens
          Alvan Clark and Sons
          Date: 1899-1900
          Object number: 1996-1-0468a-c
          4.5-inch objective lens
          4.5-inch objective lens
          American
          Date: circa 1900
          Object number: 1996-1-0481b
          24-inch Bruce doublet photographic telescope optics
          24-inch Bruce doublet photographic telescope optics
          Alvan Clark and Sons
          Date: 1890-1893
          Object number: 2016-1-0044
          6-inch telescope objective
          6-inch telescope objective
          Alvan Clark and Sons
          Date: 1890-1920
          Object number: 1997-1-0082
          4.5-inch objective lens
          4.5-inch objective lens
          American
          Date: circa 1900
          Object number: 1996-1-0481c
          4.5-inch refracting telescope
          4.5-inch refracting telescope
          John Clacey
          Date: 1883
          Object number: 1997-1-0030
          4-inch photographic objective in metal frame, stored in box
          4-inch photographic objective in metal frame, stored in box
          J. W. Fecker, Inc.
          Date: 1934
          Accessories: box
          Object number: 2014-1-0009
          5.5-inch objective lens
          5.5-inch objective lens
          Alvan Clark and Sons
          Date: circa 1900
          Object number: 1996-1-0481d
          1.375-inch telescope objective
          1.375-inch telescope objective
          American
          Date: 1890-1910
          Object number: 2007-1-0186