Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Repeating Circle - click to enlarge

Repeating Circle - click to enlarge

Repeating Circle - click to enlarge

Repeating Circle - click to enlarge

Repeating Circle - click to enlarge

Click photos to enlarge.

Repeating Circle

Catalogue number:
PH*325685

Inscriptions:
"Gambey a Paris"

Dimensions:
circle 9 inches diameter; telescope 11.5 inches long

Discussion:
The circle is silvered, graduated to 5 minutes, and read by 4 verniers with magnifiers. A tag on the box indicates that this instrument was used by the U.S. Topographical Bureau, as the mapping branch of the Army Engineers was known at that time.

Further Information:

Repeating Circle
Gambey

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