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.

Date Made: ca 1870

Maker: Secretan, Marc Francois

Location: Currently not on view

Place Made: France: Île-de-France, Paris

See more items in: Medicine and Science: Physical Sciences, Surveying and Geodesy, Measuring & Mapping


Exhibition Location:

Credit Line: Mount St. Mary's College

Data Source: National Museum of American History

Id Number: PH.326109Catalog Number: 326109Accession Number: 257245

Object Name: alidade

Physical Description: brass (overall material)Measurements: overall: 7 1/4 in x 22 in; 18.415 cm x 55.88 cmoverall 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


Record Id: nmah_764358

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