This Bausch & Lomb Petrographical Microscope Model LCH is a compound monocular with coarse and fine focus, handle arm, inclination joint, revolvable circular stage, polarizers and analyzers, adjustable mirror bar, and modified horseshoe base. The form is based on the design of Frederick Eugene Wright, a geologist with the Carnegie Institution of Washington. The inscriptions on the objective read “Bausch & Lomb Optical Co. / Rochester, N.Y.” and “SERIES 1 / ⅔ 0.25 N.A. / TUBE LENGTH 160.0 M.M.”
Ref: Bausch & Lomb, Microscopes and Accessories (Rochester, N.Y., 1919), pp. 66-67.
F. E. Wright, “A New Petrographic Microscope,” American Journal of Science 29 (1910): 407-414.
Albert Johannsen, Manual of Petrographic Methods (New York, 1918), pp. 211-212.
Currently not on view
Object Name
date made
ca 1915
Bausch & Lomb
Physical Description
metal (overall material)
glass (overall material)
brass (overall material)
overall: 37.2 cm x 10.7 cm x 18.9 cm; 14 5/8 in x 4 3/16 in x 7 7/16 in
place made
United States: New York, Rochester
ID Number
accession number
catalog number
Science & Mathematics
Science & Scientific Instruments
See more items in
Medicine and Science: Medicine
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Bausch & Lomb Optical Company

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