Repeating Circle

Repeating Circle

<< >>
Usage conditions apply
The horizontal circle of this instrument is graduated to 2 minutes, and read by opposite verniers to 2 seconds; the vertical arc is graduated to 20 minutes, and read by vernier to 3 seconds. There are two telescopes: an upper one (which is missing), and a lower one that is attached to the central pillar, below the horizontal circle. The "Chollet Delamarre Constructeur Rue de Fourcy St Antoine 6 Paris" inscription refers to a craftsman who worked in Paris in the first half of the 19th century, making repeating circles, graphometers, and other mathematical instruments.
Ref: Deleuil, Catalogue des Instruments de Physique, de Chimie, d'Optique et de Mathématiques (Paris, 1863), p. 69.
Currently not on view
Object Name
repeating circle
Delamarre, C.
place made
France: Île-de-France, Paris
horizontal circle: 8 in; 20.32 cm
lower telescope: 14 in; 35.56 cm
overall in box: 7 1/4 in x 15 3/4 in x 10 13/16 in; 18.415 cm x 40.005 cm x 27.46375 cm
ID Number
catalog number
accession number
Credit Line
Timothy Trace
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.


Add a comment about this object