Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Theodolite - click to enlarge

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Theodolite

Catalogue number:
2001.0300.01

Inscriptions:
"E. & G. W. Blunt New York"

Dimensions:
telescope 9 inches long; horizontal circle 5.25 inches diameter

Discussion:

This is probably one of the many English instruments that E. & G. W. Blunt imported soon after that firm opened for business in 1824. It may also be one of the surveying instruments that the Rensselaer Polytechnic Institute acquired soon that school opened in 1824. Overall, it is unusually small. Its horizontal circle has a beveled edge that is silvered, graduated to 30 minutes, and read by opposite verniers to single minutes. Its vertical arc is silvered, graduated to 30 minutes, and read by vernier to single minutes.

Further Information:

Theodolite
Blunt

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