Gambey Vertical Circle

Description
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.
Location
Currently not on view
date made
1840s
maker
Gambey, Henri Prudence
place made
France: Île-de-France, Paris
Measurements
telescope aperture: 1 1/4 in; 3.175 cm
telescope: 12 in; 30.48 cm
vertical circle: 6 in; 15.24 cm
overall: 15 1/4 in x 10 15/16 in x 12 1/4 in; 38.735 cm x 27.78125 cm x 31.115 cm
ID Number
PH.314631
accession number
208213
catalog number
314631
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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