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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-inch objective lens in oblique tube

2.5-inch objective lens in oblique tube

Alvan Clark and Sons
circa 1875
2-inch lens in brass cell

2-inch lens in brass cell

American
1880-1900
3.5-inch lens with coating in cell

3.5-inch lens with coating in cell

American
1900-1950
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
3-inch lens in cell

3-inch lens in cell

American
circa 1975
3-inch negative lens

3-inch negative lens

American
1875-1900
4.3-inch telescope lens

4.3-inch telescope lens

American
1880-1920
4.5-inch condensing lens

4.5-inch condensing lens

American
circa 1900
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The Collection of Historical Scientific Instruments
Science Center, Room 371 • 1 Oxford Street
Cambridge, MA 02138 •chsi@fas.harvard.edu
p. 617-495-2779 • f. 617-496-5794
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