This is an example of the American Concentric that Bausch & Lomb brought to market in the mid-1880s. It is a compound monocular with coarse and fine focus, circular stage, and tri-leg base. The sub-stage iris diaphragm and mirror can be angled above and below the stage. The body moves, as it were, within a circular arm. The inscriptions on the stage and sub-stage apparatus read “BAUSCH & LOMB OPTICAL CO.” The inscriptions on the arm read “PAT. OCT. 3, 1876” and “PAT. OCT. 13, 1885.” Jacob Dolson Cox, a lawyer, Union Army general, governor of Ohio, Secretary of the Interior, and active microscopist, devised the form.
Ref: Bausch & Lomb, Price List of Microscopes, Objectives and Accessories (Rochester, 1884), pp. 22-23.
Currently not on view
Object Name
date made
ca 1885
Bausch & Lomb
overall: 12 1/4 in x 7 1/2 in x 10 1/2 in; 31.115 cm x 19.05 cm x 26.67 cm
place made
United States: New York, Rochester
ID Number
accession number
catalog number
Science & Scientific Instruments
See more items in
Medicine and Science: Medicine
Science & Mathematics
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Bausch & Lomb Optical Company

Visitor Comments

5/8/2016 6:03:20 PM
Paul Ferraglio
Unless there is a separate set of binocular tubes not shown, this is a monocular model.
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