Secretan Alidade

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This brass alidade has folding sights that are centered on the beveled edge. It belonged to Mount St. Mary's College in Emmitsburg, Md. 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. The firm was still in business in 1930.
Currently not on view
date made
ca 1870
Secretan, Marc Francois
place made
France: Île-de-France, Paris
Physical Description
brass (overall material)
overall: 7 1/4 in x 22 in; 18.415 cm x 55.88 cm
overall in case: 2 1/4 in x 22 7/8 in x 3 5/8 in; 5.715 cm x 58.1025 cm x 9.2075 cm
ID Number
catalog number
accession number
Credit Line
Mount St. Mary's College
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History


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