This AO-Baker Interference microscope is a compound binocular with coarse and fine focus, circular mechanical stage, sub-stage mirror, and U-shaped base. The inscription on the front reads “AO / Spencer.” That underneath the base reads “B-35-83 Instrument Division / American Optical Co. / Buffalo 15, N.Y. MADE IN USA / U.S. Pat. / 2,474,644 / DES 148,123 / OR 148,124.” The 373366 serial number on the back of the base indicates a date of around 1955.
The American Optical Company introduced the AO-Baker interference microscope in 1955, noting that it was “so accurate that it can resolve 35,000 units of measurement in the thickness of this page.”
Ref: T. G. Aitcheson, et. al., “Pivotal Mounting Means for Microscope Arms and the Like,” U.S. Patent 2,474,644 (June 28, 1949).
American Optical Co. ad in Transactions of the American Microscopical Society 74 (Oct. 1955).
Currently not on view
date made
ca 1995
American Optical Company
place made
United States: New York, Buffalo
case of attachments: 2 3/4 in x 5 3/4 in x 4 1/4 in; 6.985 cm x 14.605 cm x 10.795 cm
ID Number
accession number
catalog number
Credit Line
Mr. Oscar W. Richards
Science & Scientific Instruments
See more items in
Medicine and Science: Medicine
Science & Mathematics
Data Source
National Museum of American History, Kenneth E. Behring Center


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