Repeating Circle

Repeating Circle

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Description
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.
Location
Currently not on view
Object Name
repeating circle
maker
Delamarre, C.
place made
France: Île-de-France, Paris
Measurements
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
PH.317690
catalog number
317690
accession number
231960
Credit Line
Timothy Trace
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Data Source
National Museum of American History
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