Microscope
date: label: date made
content: ca 1880
name: label: maker
content: Hartnack, Edmund
notes: label: Description
content: 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.”
label: Description
content: 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.
label: Description
content: 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.
label: Location
content: Currently not on view
place: label: place made
content: Germany: Brandenburg, Potsdam
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Microscopes
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content: Science & Mathematics
creditLine: label: Credit Line
content: Whitman Cross II
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2014.0264.02
label: catalog number
content: 2014.0264.02
label: accession number
content: 2014.0264
objectType: label: Object Name
content: microscope
physicalDescription: label: Physical Description
content: glass (overall material)
label: Physical Description
content: brass (overall material)
label: Physical Description
content: nickel (overall material)
label: Measurements
content: 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
label: Measurements
content: overall in case: 4 5/8 in x 12 1/4 in x 7 1/4 in; 11.7475 cm x 31.115 cm x 18.415 cm