<< >>
Usage conditions apply
This brass alidade, with folding sights centered on the beveled edge, 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
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
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.


Add a comment about this object