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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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