Randolph Surveyor's Vernier Compass

This compass is marked "T. R. RANDOLPH CINCINNATI. O." and "1234" and "PATENTED JUNE 24 '79." On June 24, 1879, Theodore F. Randolph received a patent (#216,759) for a surveyor's compass with a telescope sight, in which the telescope and its supports can be detached from the compass. In this example (which is missing the telescope and its supports) the raised rim is silvered, and graduated to 30 minutes. The variation arc, which is located on the compass face, extends 25 degrees either way, and reads by double vernier to single minutes. The carrying case is marked "PATENTED NOV. 9, 1880," referring to Randolphs' patent (#234,331) for a seamless leather container of this sort. This instrument belonged to the University of Missouri at Columbia.
Ref: T. F. Randolph, Illustrated Catalogue and Price List (Cincinnati, 1892), p. 2.
Currently not on view
Object Name
Randolph, Theodore F.
overall: 7 in; 17.78 cm
place made
United States: Ohio, Cincinnati
ID Number
catalog number
accession 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
Randolph, T. F.. Illustrated Catalogue and Price List
Additional Media

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