Level

Level

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Description
John Clark, of Washington, D.C., obtained a U.S. patent for a telescopic level in 1879. This is the model he submitted with his patent application. Clark was probably a machinist at the U.S. Naval Observatory.
Ref: John Clark, “Telescope Level,” U.S. Patent 218,710 (August 19, 1879).
Location
Currently not on view
Object Name
level
Object Type
Patent Model
Measurements
overall: 3 5/8 in x 2 1/4 in x 7 1/8 in; 9.2075 cm x 5.715 cm x 18.0975 cm
overall: 3 3/4 in x 2 3/16 in x 7 3/8 in; 9.525 cm x 5.55625 cm x 18.7325 cm
ID Number
PH.308966
catalog number
308966
accession number
89797
patent number
218,710
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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