Gambey Vertical Circle

This is one of several Gambey instruments that the U. S. Coast Survey acquired in the mid-1840s. It is heavy, stable, and precise. The circle itself is silvered, finely graduated (probably to 5 minutes), and read by opposite verniers and magnifiers. The signature reads "Gambey a Paris." The "U S C & G S NO 21" inscription must have been added after 1878, when the Coast Survey became the Coast and Geodetic Survey.
Currently not on view
Object Name
vertical circle
date made
Gambey, Henri Prudence
telescope aperture: 1 1/4 in; 3.175 cm
telescope: 12 in; 30.48 cm
vertical circle: 6 in; 15.24 cm
place made
France: Île-de-France, Paris
ID Number
accession number
catalog number
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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