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This graphometer has telescopic rather than open sights. Its semicircle is graduated to 30 minutes, numbered clockwise and counterclockwise, and read by verniers at either end of the alidade to single minutes. The "LeRebours à Paris" signature refers to Nöel–Jean Lerebours (1761–1840) or his son, Nöel–Marie Paymal Lerebours (1794–1855). Both were prominent instrument makers in Paris. The firm became Lerebours et Secretan in 1845.
Ref: Paolo Brenni, "Lerebours et Secretan," Bulletin of the Scientific Instrument Society 40 (March 1994): 3–6.
Currently not on view
Object Name
place made
France: Île-de-France, Paris
overall: 11 in; 27.94 cm
needle: 2 7/8 in; 7.3025 cm
telescopes: 14 7/8 in; 37.7825 cm
overall; base: 11 in x 7 in; 27.94 cm x 17.78 cm
overall; graphometer: 7 in x 15 in x 6 in; 17.78 cm x 38.1 cm x 15.24 cm
ID Number
catalog number
accession number
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Surveying and Geodesy
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National Museum of American History
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