Microscope

Description
This is a compound monocular designed for petrographic work. It has coarse and fine focus, analyzer in the tube, square stage with circular top graduated to degrees, sub-stage polarizer, sub-stage mirror, heavy horseshoe base, and wooden box. The inscription on the tube reads “Dr. E. Hartnack / Potsdam.” The serial number “19544” appears on a smaller wooden box that holds seven lenses. A brass plate on the box reads “C. Whitman Cross.”
Edmund Hartnack (1826-1891) was an accomplished microscope maker in Paris who received an honorary doctorate from the University of Bonn in 1868, moved to Potsdam in 1870, at the start of the Franco-Prussian War, and adopted the "Dr. E. Hartnack" signature in 1879.
Charles Whitman Cross (1854-1959) was an American geologist who graduated from Amherst College, studied in Göttingen, and received a PhD from the University of Leipzig. His dissertation was supervised by Ferdinand Zirkel, an early proponent of microscopical petrography, the practice of using a polarizing microscope to observe thin sections of rocks. Joining the U.S. Geological Survey, Cross specialized in the classification of igneous rocks. He became an active member of the National Academy of Sciences, and an Associate in Petrology at the Smithsonian Institution.
Location
Currently not on view
Object Name
microscope
date made
ca 1880
maker
Hartnack, Edmund
Physical Description
glass (overall material)
brass (overall material)
nickel (overall material)
Measurements
overall: 11 1/4 in x 3 1/2 in x 4 3/4 in; 28.575 cm x 8.89 cm x 12.065 cm
place made
Deutschland: Brandenburg, Potsdam
ID Number
2014.0264.02
catalog number
2014.0264.02
accession number
2014.0264
subject
Science & Scientific Instruments
Microscopes
Science & Mathematics
See more items in
Medicine and Science: Physical Sciences
Microscopes
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Whitman Cross II
Additional Media

Visitor Comments

5/8/2016 5:35:54 PM
Paul Ferraglio
The serial number can also be found stamped into the wood on the top edge of the box to the right of the lock.
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.

Image CAPTCHA
Enter the characters shown in the image.