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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
Credit Line
Lafayette College
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
20th century
ID Number
catalog number
accession number
Franz Schmidt & Haensch
Science & Scientific Instruments
place made
Germany: Berlin
overall: 10 1/4 in; 26.035 cm
overall: 10 5/8 in x 9 1/4 in x 16 3/4 in; 26.9875 cm x 23.495 cm x 42.545 cm
National Museum of American History
Object Name