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8-inch element for telescope objective
8-inch element for telescope objective

8-inch element for telescope objective

Date1880-1890
Inventory Number1998-1-0456a
ClassificationLens
Subject
    Maker Alvan Clark and Sons ? 1846 - 1958
    User Harvard College Observatory ? founded 1839
    Cultural Region
      Place of Origin
        Dimensions20.3 x 20.3 x 1.7 cm (8 x 8 x 11/16 in.)
        Material
          DescriptionThis is likely a lens element from a telescope objective. It is plano-convex with very slight curvature. It has an aperture of 8 inches. There is red rouge around the ground edge. There is a scratch on the plane surface.
          Signedunsigned
          Historical AttributesThis lens element has an 8-inch diameter and may be part of one of the Harvard College Observatory's 8-inch photographic telescopes. These were the Bache telescope (1885), the Boyden telescope (1887), and the Draper telescope (1889). These instruments traveled to Harvard's field stations in Peru and South Africa. All were made by Alvan Clark & Sons, who may have made this lens.
          7.75-inch flint glass lens element for telescope objective
          7.75-inch flint glass lens element for telescope objective
          Alvan Clark and Sons
          Date: 1880-1910
          Object number: 1998-1-0456b
          8-inch crown-glass element for telescope objective
          8-inch crown-glass element for telescope objective
          Alvan Clark and Sons
          Date: 1870-1900
          Object number: 1996-1-0488
          12-inch flint-glass element for f/135 telescope objective
          12-inch flint-glass element for f/135 telescope objective
          Alvan Clark and Sons
          Date: 1899-1900
          Object number: 1996-1-0468a
          12-inch crown-glass element for f/135 telescope objective
          12-inch crown-glass element for f/135 telescope objective
          Alvan Clark and Sons
          Date: 1899-1900
          Object number: 1996-1-0468b
          8-inch crown-glass element for rear doublet of f/16.5 Boyden telescope
          8-inch crown-glass element for rear doublet of f/16.5 Boyden telescope
          Alvan Clark and Sons
          Date: 1887
          Object number: 1996-1-0473a
          8-inch flint-glass element for rear doublet for f/16.5 Boyden telescope
          8-inch flint-glass element for rear doublet for f/16.5 Boyden telescope
          Alvan Clark and Sons
          Date: 1887
          Object number: 1996-1-0473b
          10-inch flint-glass element for rear doublet of Boyden telescope
          10-inch flint-glass element for rear doublet of Boyden telescope
          Alvan Clark and Sons
          Date: 1889
          Object number: 1996-1-0470b
          2.5-inch cemented doublet lens
          2.5-inch cemented doublet lens
          Alvan Clark and Sons
          Date: circa 1900
          Object number: 1998-1-0416a
          10-inch crown-glass element for rear doublet of Boyden telescope
          10-inch crown-glass element for rear doublet of Boyden telescope
          Alvan Clark and Sons
          Date: 1889
          Object number: 1996-1-0470a
          2.5-inch lens
          2.5-inch lens
          Alvan Clark and Sons
          Date: circa 1900
          Object number: 1998-1-0416b
          2.5-inch objective lens in oblique tube
          2.5-inch objective lens in oblique tube
          Alvan Clark and Sons
          Date: circa 1875
          Object number: 1996-1-0511
          6.5-inch, f/1.5 crown glass telescope lens
          6.5-inch, f/1.5 crown glass telescope lens
          American
          Date: 1880-1920
          Object number: 1998-1-0514a