Secretan Alidade

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
Object Name
date made
ca 1870
Secretan, Marc Francois
Physical Description
brass (overall material)
overall: 7 1/4 in x 22 in; 18.415 cm x 55.88 cm
place made
France: Île-de-France, Paris
ID Number
catalog number
accession number
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Mount St. Mary's College

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