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
date made
ca 1907
Fuess, Rudolf
place made
Deutschland: Berlin, Steglitz
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
overall in case: 15 7/8 in x 8 9/16 in x 7 5/8 in; 40.3225 cm x 21.74875 cm x 19.3675 cm
ID Number
catalog number
accession number
Credit Line
Whitman Cross II
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History