Delamarre Repeating Circle

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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 circle is marked "Chollet Delamarre Constructeur Rue de Fourcy St Antoine 6 Paris." Delamarre worked in Paris in the first half of the 19th century, making repeating circles, graphometers, and other instruments.
Ref: Deleuil, Catalogue des Instruments de Physique, de Chimie, d'Optique et de Mathématiques (Paris, 1863), p. 69.
Currently not on view
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
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Medicine and Science: Physical Sciences
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Surveying and Geodesy
Data Source
National Museum of American History


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