Spectroscope

Description
This is a 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.
Location
Currently not on view
date made
early 20th century
maker
Central Scientific Company
place made
United States: Illinois, Chicago
Measurements
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
PH.337125
catalog number
337125
accession number
1979.0026
subject
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Optics
Data Source
National Museum of American History, Kenneth E. Behring Center

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