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9.5-inch telescope objective for finder to 60-inch reflecting telescope

9.5-inch telescope objective for finder to 60-inch reflecting telescope

Andrew A. Common
circa 1889
12-inch crown-glass element for f/135 telescope objective

12-inch crown-glass element for f/135 telescope objective

Alvan Clark and Sons
1899-1900
12-inch, f/135 doublet objective lens

12-inch, f/135 doublet objective lens

Alvan Clark and Sons
1899-1900
12-inch flint-glass element for f/135 telescope objective

12-inch flint-glass element for f/135 telescope objective

Alvan Clark and Sons
1899-1900
15.875-inch secondary mirror for 60-inch reflecting telescope

15.875-inch secondary mirror for 60-inch reflecting telescope

Andrew A. Common
circa 1889
Image Not Available

24-inch Bruce doublet photographic telescope optics

Alvan Clark and Sons
1890-1893
Abbot-type silver disk pyrheliometer

Abbot-type silver disk pyrheliometer

Smithsonian Astrophysical Observatory
1910-1920
additional wind cup

additional wind cup

Blue Hill Meteorological Observatory
1890-1910
aerial photograph of hut and clearings in rainforest in Rio Parima

aerial photograph of hut and clearings in rainforest in Rio Parima

Institute of Geographical Exploration
1920-1940
aerial photograph of Lower Manhattan

aerial photograph of Lower Manhattan

Institute of Geographical Exploration
1910-1935
aerial photograph of Mount Vernon

aerial photograph of Mount Vernon

Institute of Geographical Exploration
1920-1940
aerial photograph of Mount Vernon (close-up)

aerial photograph of Mount Vernon (close-up)

Blue Hill Meteorological Observatory
1912-1940
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The Collection of Historical Scientific Instruments
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