Shilling Gradienter

Description
This instrument is marked "Geo. Shilling Washn D.C." and "U.S.G.S. No 4." It was made after 1882 when George Shilling started out in business, and before 1907 when the U.S. Geological Survey transferred it to the Smithsonian. The horizontal circle and vertical arc are silvered, graduated to 30 minutes, and read by verniers to single minutes. A level vial sits atop the telescope; a circular level sits on the horizontal circle, obscuring most of Shilling's signature.
Location
Currently not on view
Object Name
gradienter
maker
Shilling, George
Measurements
horizontal circle: 4 1/4 in; 10.795 cm
telescope: 9 1/2 in; 24.13 cm
place made
United States: District of Columbia, Washington
ID Number
PH*247907
catalog number
247907
accession number
47736
subject
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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