- Direct vision spectroscope inscribed “WALLACE / SPECTROSCOPE / CENTRAL SCIENTIFIC CO. / CHICAGO.” Instead of a prism assembly, this instrument has a replica diffraction grating of the sort developed by Robert James Wallace (1868-1945), a photographer at the Yerkes Observatory in Williams Bay, Wisconsin.
- Ref: Robert J. Wallace, “Diffraction Grating Replicas,” Astrophysical Journal 22 (1905): 123-130, and 23 (1906): 96-99.
- Central Scientific Company, Physical and Chemical Apparatus (Chicago, 1909), p. 234.
- Currently not on view
- Object Name
- date made
- early 20th century
- Central Scientific Company
- place made
- United States: Illinois, Chicago
- overall: 4 in; 10.16 cm
- overall in housing: 3 11/16 in x 3 1/4 in x 6 7/16 in; 9.36625 cm x 8.255 cm x 16.35125 cm
- ID Number
- catalog number
- accession number
- Science & Scientific Instruments
- Data Source
- National Museum of American History
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