Lenoir Reflecting Circle
date: label: date made
content: 1790s
name: label: maker
content: Lenoir, Etienne
notes: label: Description
content: The Chevalier de Borda, in Paris, published a description of his new reflecting circle in 1787. This example belonged to Columbia College (now University) in New York, and probably dates from the 1790s. It has a silvered scale graduated every 20 minutes and read by two verniers with tangent screws and magnifiers to single minutes. The "Lenoir A Paris no 10" inscription is that of Étienne Lenoir (1744-1832), the French craftsman who made Borda’s first instrument of this sort.
label: Description
content: Ref: A. J. Turner, <i>From Pleasure and Profit to Science and Security. Étienne Lenoir and the transformation of precision instrument-making in France, 1760-1830</i> (Cambridge: Whipple Museum of the History of Science, 1989).
label: Location
content: Currently not on view
place: label: place made
content: France: Île-de-France, Paris
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Navigation
label: See more items in
content: Measuring & Mapping
creditLine: label: Credit Line
content: Columbia University
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.320412
label: catalog number
content: 320412
label: accession number
content: 242377
objectType: label: Object Name
content: reflecting circle
physicalDescription: label: Measurements
content: overall: 10 1/2 in; 26.67 cm
label: Measurements
content: overall in case: 3 in x 12 3/4 in x 12 1/2 in; 7.62 cm x 32.385 cm x 31.75 cm