E. & G. W. Blunt Theodolite

This theodolite is signed "E. & G. W. Blunt New York" but was probably one of the many English instruments that the Blunts imported soon after the firm opened for business in 1824. It may also be one of the surveying instruments that the Rensselaer Polytechnic Institute acquired soon after that school opened in 1824.
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.
Currently not on view
Object Name
E. & G. W. Blunt
telescope: 9 in; 22.86 cm
horizontal circle: 5 1/4 in; 13.335 cm
overall: 23 cm x 13 cm x 24.5 cm; 9 1/16 in x 5 1/8 in x 9 21/32 in
ID Number
accession number
catalog number
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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