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2 x 3.5 inch 60° mounted prism
2 x 3.5 inch 60° mounted prism

2 x 3.5 inch 60° mounted prism

Date1880-1920
Inventory Number1997-1-1697
ClassificationPrism
Subject
    Maker American
    Cultural Region
      Dimensions8.7 × 10.5 × 10.5 cm (3 7/16 × 4 1/8 × 4 1/8 in.)
      Material
        DescriptionThe prism is secured in place between a cast brass circular platform and a square brass header. There are four columns between the top plate and base. These are hollow brass tubes held in place by screws at each corner.

        The mount is supported by three leveling screw feet. The screws are knurled and gilt as is the edge of the base. The top of the base platform is blackened.

        The 60° prism is chipped on several edges. The polished faces are rectangular, 2 x 3.5 inches.
        Signedunsigned
        2 x 2 inch 60° prism on stand
        2 x 2 inch 60° prism on stand
        American
        Date: 1850-1900
        Object number: 1997-1-1695
        3.25 x 3.5 inch, half-prism
        3.25 x 3.5 inch, half-prism
        Alvan Clark and Sons
        Date: 1875-1900
        Object number: 1997-1-1690
        mounted 60° prism
        mounted 60° prism
        Jean Baptiste François Soleil
        Date: 1825-1875
        Object number: 1998-1-1217
        objective prism for Metcalf 16-inch astrograph
        objective prism for Metcalf 16-inch astrograph
        Joel Hastings Metcalf
        Date: 1909
        Accessories: box
        Object number: 2023-1-0011
        6 x 10 inch, 60° prism
        6 x 10 inch, 60° prism
        American
        Date: 1870-1900
        Object number: 1997-1-1519a
        6 x 10 inch, 60° prism
        6 x 10 inch, 60° prism
        American
        Date: 1870-1900
        Object number: 1997-1-1519b
        box with 3 prisms
        box with 3 prisms
        Louis Jules Duboscq
        Date: 1850-1875
        Accessories: three prisms, smallest in cardboard box
        Object number: 1998-1-0410
        2.25 x 2.4 inch, 45° prism in swing-away mount
        2.25 x 2.4 inch, 45° prism in swing-away mount
        American
        Date: 1875-1925
        Object number: 1997-1-1699
        mounted Zeiss Tessar lens
        mounted Zeiss Tessar lens
        Carl Zeiss Jena
        Date: 1920-1940
        Object number: 1997-1-1521
        30°-60°-90° mounted prism
        30°-60°-90° mounted prism
        Jean Baptiste François Soleil
        Date: 1840-1875
        Object number: 1998-1-1210a
        30°-60°-90° mounted prism
        30°-60°-90° mounted prism
        Jean Baptiste François Soleil
        Date: 1840-1875
        Object number: 1998-1-1210b
        60° mounted prism
        60° mounted prism
        Jean Baptiste François Soleil
        Date: 1840-1875
        Object number: 1998-1-1210c