This is a compound monocular designed for petrographic work. It has coarse and fine focus, analyzer in the tube, large circular mechanical stage, inclination joint, sub-stage polarizer, sub-stage mirror, horseshoe base, and wooden box. The inscription on the base reads “R. FUESS / STEGLITZ-BERLIN / 1380.” The serial number indicates a date of around 1907.
Rudolph Fuess (1838-1917) began as an instrument maker in Berlin in 1859, acquired the workshop of Greiner & Geissler in 1876, and began making petrographic microscopes around that time. The firm moved to Steglitz, a suburb of Berlin, in 1891.
This was owned and used by Charles Whitman Cross (1854-1959), an American geologist who specialized in the classification of igneous rocks, worked for the U.S. Geological Survey, and became an Associate in Petrology at the Smithsonian Institution.
Ref: R. Fuess, Optische Instrumente (Steglitz, 1907), p. 43.
Currently not on view
Object Name
date made
ca 1907
Fuess, Rudolf
Physical Description
brass (overall material)
nickel (overall material)
glass (overall material)
overall: 14 1/4 in x 4 in x 6 in; 36.195 cm x 10.16 cm x 15.24 cm
place made
Deutschland: Berlin, Steglitz
ID Number
catalog number
accession number
Science & Scientific Instruments
Science & Mathematics
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Whitman Cross II
Additional Media

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Enter the characters shown in the image.