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2.5-inch projection lens

2.5-inch projection lens

Ernst Leitz (company)
circa 1956
2 eyepieces with cross-hairs

2 eyepieces with cross-hairs

American
1875-1900
Image Not Available

2 filters

French
1875-1925
2 internal aperture stops

2 internal aperture stops

German
1875-1900
2 internal aperture stops

2 internal aperture stops

German
1875-1900
3.5X magnifier

3.5X magnifier

Bausch & Lomb Optical Company
1937-1947
3.8-inch hot cathode high vacuum X-ray tube

3.8-inch hot cathode high vacuum X-ray tube

Victor Electric Company
1920-1925
3 cup diaphragms

3 cup diaphragms

German
1875-1900
4.1-inch flat heliostat mirror

4.1-inch flat heliostat mirror

American
mid 20th Century
4.5-inch telescope objective

4.5-inch telescope objective

Bausch & Lomb Optical Company
circa 1900
4-inch heated cathode high vacuum x-ray tube

4-inch heated cathode high vacuum x-ray tube

General Electric Company
circa 1925
4-inch heated cathode high vacuum x-ray tube

4-inch heated cathode high vacuum x-ray tube

General Electric Company
circa 1925
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The Collection of Historical Scientific Instruments
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