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1/4-scale model of the UV scanning polychromator spectroheliometer, S055

1/4-scale model of the UV scanning polychromator spectroheliometer, S055

Harvard College Observatory
1970-1973
1.5-inch refracting telescope

1.5-inch refracting telescope

Alvan Clark and Sons
1880-1910
1.75-inch refracting telescope

1.75-inch refracting telescope

Alvan Clark and Sons
1880-1910
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 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
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The Collection of Historical Scientific Instruments
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