Delamarre Repeating Circle

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 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.
Location
Currently not on view
Object Name
repeating circle
maker
Delamarre, C.
Measurements
horizontal circle: 8 in; 20.32 cm
lower telescope: 14 in; 35.56 cm
place made
France: Île-de-France, Paris
ID Number
PH*317690
catalog number
317690
accession number
231960
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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