Secretan Reflecting Telescope

This equatorially mounted telescope, made in Paris around 1860, has a 4-inch aperture silvered-glass primary mirror of the sort proposed by the physicist J. B. L. Foucault. A small printed label on the square wooden tube carries the message “Les Télescopes à mirroir de verre qui se vendent dans la maison SECRETAN portent tous la signature ci-dessous” along with Foucault’s signature. A one-page lithographed “Instruction pour les Télescopes de verre argenté” carries the stamp of Lerebours et Secretan.
Marc François Louis Secretan was a scientific instrument maker in Paris who worked in partnership with, and then succeeded, Noel-Lean Lerebours.
Currently not on view
date made
after 1860
place made
France: Île-de-France, Paris
overall: 27 3/4 in x 15 7/8 in x 19 1/2 in; 70.485 cm x 40.3225 cm x 49.53 cm
overall: 19 7/8 in x 15 3/4 in x 25 1/4 in; 50.4825 cm x 40.005 cm x 64.135 cm
ID Number
accession number
catalog number
See more items in
Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History


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