Randolph Surveyor's Vernier Compass

Description
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.
Location
Currently not on view
maker
Randolph, Theodore F.
place made
United States: Ohio, Cincinnati
Measurements
overall: 7 in; 17.78 cm
overall in box: 5 1/2 in x 8 in x 8 in; 13.97 cm x 20.32 cm x 20.32 cm
ID Number
PH.333647
catalog number
333647
accession number
300659
Credit Line
University of Missouri-Columbia, Department of Civil Engineering
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

Comments

Add a comment about this object