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1.875 x 2.25 inch rock salt prism in sealed tube

1.875 x 2.25 inch rock salt prism in sealed tube

John A. Brashear
1916
2.25-inch refracting telescope

2.25-inch refracting telescope

Optisches Institut von Dr. Steeg & Reuter
circa 1880
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
3 polished quartz plates

3 polished quartz plates

American
1900-1925
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
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