Secretan Theodolite

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This theodolite is marked "Secretan a Paris." It was made after 1855 when Marc François Secretan went into business on his own, and before 1901 when the Smithsonian purchased it from Anthony J. Gies, commissioner of streets and drainage in Manila, for use in the Pan American Exhibition. It is similar to the instrument that Secretan called a repeating theodolite. The horizontal circle is silvered, graduated to 10 minutes, and read by four verniers and two magnifiers to 20 seconds. The vertical circle is silvered, graduated to 15 minutes, and read by two double verniers to 30 seconds.
Ref: L'Industrie Française des Instruments de Précision, Catalogue (Paris, 1901–1902), pp. 247–252.
Currently not on view
Secretan, Marc Francois
place made
France: Île-de-France, Paris
overall: 12 in; 30.48 cm
horizontal circle: 5 1/4 in; 13.335 cm
vertical circle: 3 3/4 in; 9.525 cm
telescope: 12 in; 30.48 cm
needle: 2 1/4 in; 5.715 cm
overall: 12 1/8 in x 7 1/2 in x 12 1/4 in; 30.7975 cm x 19.05 cm x 31.115 cm
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Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History