Kolesch Transit

This is marked "Kolesch & Co. New York. 1796." The firm termed it an Engineer's Transit, No. 7650. The horizontal circle is graduated every 20 minutes, and is read by opposite verniers with celluloid reflectors to 30 seconds. There is a clamp and tangent to the telescope. New, it cost $160.
Heinrich Adolph Kolesch (1855-1903) was a German immigrant who began in business in 1885, taking over the firm that had been founded by E. & G. W. Blunt. Kolesch & Co. was still using the Blunt dividing engine in 1925. The firm was incorporated in New York State in 1904, and dissolved in 1947.
Ref: Kolesch & Co., Illustrated Catalogue and Price-List (New York, 1913), pp. 228-229 for this type of instrument, and pp. 195 and 198 for the history of the firm.
Currently not on view
Object Name
date made
after 1885
Kolesch and Company
overall: 12 1/4 in; 31.115 cm
horizontal circle: 6 in; 15.24 cm
needle: 4 1/2 in; 11.43 cm
telescope: 10 1/4 in; 26.035 cm
hanging level: 5 in; 12.7 cm
place made
United States: New York, New York
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
cited; maker referenced
Kolesch & Co.. Illustrated Catalogue and Price-List

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