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7° objective prism
7° objective prism

7° objective prism

Datecirca 1900
Inventory Number1996-1-0481t
ClassificationObjective Prism
Subject
    Maker Alvan Clark and Sons ? 1846 - 1958
    Maker Harvard College Observatory founded 1839
    Cultural Region
      Place of Origin
        Dimensions8 x 15.9 x 2.2 cm (3 1/8 x 6 1/4 x 7/8 in.)
        Material
          Description1996-1-0481t and 1996-1-0481u are objective prisms formed by slicing on circular one in half along its axis. The edges still have rouge. This example is chipped. The angle is between 7° and 7 1/4°.
          Signedunsigned
          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.
          7.5° objective prism
          7.5° objective prism
          Alvan Clark and Sons
          Date: circa 1900
          Object number: 1996-1-0481u
          6 1/8-inch objective prism
          6 1/8-inch objective prism
          Alvan Clark and Sons
          Date: 1900-1920
          Object number: 1996-1-0483a
          5.5-inch objective lens
          5.5-inch objective lens
          Alvan Clark and Sons
          Date: circa 1900
          Object number: 1996-1-0481d
          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
          prism train for direct vision astronomical spectroscope
          prism train for direct vision astronomical spectroscope
          Alvan Clark and Sons
          Date: 1860-1870
          Accessories: square wooden case with velvet cushioning
          Object number: 1996-1-0029
          square wooden case for prism train
          square wooden case for prism train
          Alvan Clark and Sons
          Date: 1860-1870
          Accessories: square wooden case with velvet cushioning
          Object number: 1996-1-0029a
          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
          2.5 x 2.5 inch, 31° carbonic disulphide liquid prism
          2.5 x 2.5 inch, 31° carbonic disulphide liquid prism
          Alvan Clark and Sons
          Date: circa 1875
          Object number: 2007-1-0029
          Image Not Available for 7.5-inch objective lens of Agassiz's telescope
          7.5-inch objective lens of Agassiz's telescope
          Alvan Clark and Sons
          Date: 1900
          Object number: 2016-1-0025a
          10-inch telescope objective with photographic correcting lens
          10-inch telescope objective with photographic correcting lens
          Alvan Clark and Sons
          Date: circa 1890
          Object number: 1996-1-0472
          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