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1-inch double convex lens

1-inch double convex lens

American
1910-1940
2.5-inch cemented doublet lens

2.5-inch cemented doublet lens

Alvan Clark and Sons
circa 1900
2.5-inch lens

2.5-inch lens

Alvan Clark and Sons
circa 1900
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 frosted glass disks

2 frosted glass disks

American
1910-1940
2 internal aperture stops

2 internal aperture stops

German
1875-1900
2 neutral density filters

2 neutral density filters

Globe Optical Company
1900-1920
2 neutral density filters

2 neutral density filters

American
1910-1940
2 sphero-cylinder lenses

2 sphero-cylinder lenses

American Optical Company
1910-1940
3.9-inch, f/4.5 telescope lens

3.9-inch, f/4.5 telescope lens

American
1880-1920
3.375-inch telescope lens

3.375-inch telescope lens

American
1880-1920
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The Collection of Historical Scientific Instruments
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p. 617-495-2779 • f. 617-496-5794
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