This is a solid and substantial instrument of iron and brass. The horizontal circle, 4.25 inches diameter, is graduated by half degrees and read, by verniers with magnifying lenses, to single minutes of arc. The prism is missing. The "Franz Schmidt & Haensch" "Berlin, S." inscription on the circle refers to an optical instrument firm that began in business in 1864, and that trades today as Schmidt & Haensch.
Franz Schmidt & Haensch described this as a small spectrometer according to Victor von Lang. Von Lang (1838-1921) was a noted crystallographer in Vienna who described the form in the late 1870s.
Ref. Special Catalogue of the Collective Exhibition of Scientific Instruments Exhibited by the Deutsche Gesellschaft für Mechanik und Optik (Berlin, 1893), pp. 97-98.
German Educational Exhibition, World’s Fair St. Louis 1904, Scientific Instruments (Berlin, 1904), p. 124.
Currently not on view
Object Name
date made
20th century
Franz Schmidt & Haensch
overall: 10 1/4 in; 26.035 cm
place made
Deutschland: Berlin
ID Number
catalog number
accession number
Science & Scientific Instruments
Science & Mathematics
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Lafayette College

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