Secretan Graphometer

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This graphometer belonged to Mount St. Mary's College in Emmitsburg, Md. Its semicircle is silvered, graduated to 30 minutes, numbered clockwise and counterclockwise, and read by verniers at either end of the alidade to single minutes. The instrument is marked "Secretan à Paris." A label in the box reads: "Lerebours & Secretan, Secretan Successeur, Optician de S. M. l'Empereur, de l'Observatoire & de la Marine. Magasins: 13, Rue Du Pont-Neuf, Ateliers: 9, Rue Mechain, Faubg St. Jacques Paris." The address of the atelier suggests a date of around 1870.
Marc François Secretan (1804–1867) went into partnership with N. M. P. Lerebours in Paris in 1844, and became the sole proprietor of the shop in 1855. The shop offered a wide range of scientific apparatus, showed its wares at several international exhibitions, and was still in business in 1930.
Ref: Paolo Brenni, "Lerebours et Secretan," Bulletin of the Scientific Instrument Society 40 (March 1994): 3–6
Currently not on view
date made
ca 1870
Mount St. Mary's College
Secretan, Marc Francois
place made
France: Île-de-France, Paris
overall: 8 in; 20.32 cm
needle: 1 1/2 in; 3.81 cm
overall in case: 5 3/4 in x 9 1/4 in x 5 1/8 in; 14.605 cm x 23.495 cm x 13.0175 cm
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catalog number
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History