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Classification / Category: Prism

1.875 x 2.25 inch rock salt prism in sealed tube

1.875 x 2.25 inch rock salt prism in sealed tube

John A. Brashear

1916

1 equilateral prism

1 equilateral prism

John A. Brashear

circa 1890

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

circa 1875

2.5 x 2.5 inch, 90° prism in housing

2.5 x 2.5 inch, 90° prism in housing

American

1900-1930

2.5 x 2.5 inches right angle prism

2.5 x 2.5 inches right angle prism

American

circa 1900

2.5 x 2.5 inches right angle prism

2.5 x 2.5 inches right angle prism

American

circa 1900

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

1875-1925

2 arsenal prisms

2 arsenal prisms

American

1900-1950

2 small prisms joined with sealing wax

2 small prisms joined with sealing wax

American

circa 1900

2 x 2 inch 60° prism on stand

2 x 2 inch 60° prism on stand

American

1850-1900

2 x 3.5 inch 60° mounted prism

2 x 3.5 inch 60° mounted prism

American

1880-1920

3.25 x 3.5 inch, half-prism

3.25 x 3.5 inch, half-prism

Alvan Clark and Sons

1875-1900

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