Surveyor's Vernier Compass


The rim of this Gurley vernier compass is graduated to 30 minutes. The variation arc on the south arm extends 20 degrees either way, and is read by folded vernier to 2 minutes. Two level vials are on the north arm, and an outkeeper is on the south arm. The side of one vertical sight is graduated to half degrees, for determining angles of elevation or depression. The machine-engraved signature indicates that it was made after 1876. This compass came to the Smithsonian from the University of Missouri at Columbia.

Ref: W. & L. E. Gurley, A Manual of the Principal Instruments Used in American Engineering and Surveying (Troy, N.Y., 1904), pp. 108-120.

W. Skerritt, "W. & L. E. Gurley's Engraving Machine," Rittenhouse 11 (1997): 97-100.

Maker: W. & L. E. Gurley

Location: Currently not on view

Place Made: United States: New York, Troy

See more items in: Medicine and Science: Physical Sciences, Surveying and Geodesy, Measuring & Mapping


Exhibition Location:

Related Publication: W. & L. E. Gurley. Manual of the Prinicipal Instruments Used in American Engineering and Surveying; 37th Edition

Credit Line: University of Missouri-Columbia, Department of Civil Engineering

Data Source: National Museum of American History

Id Number: PH.333661Catalog Number: 333661Accession Number: 300659

Object Name: Surveyor's Compass

Measurements: overall length: 15 1/2 in; 39.37 cmneedle: 6 in; 15.24 cmoverall in case: 4 5/8 in x 16 1/2 in x 8 7/16 in; 11.7475 cm x 41.91 cm x 21.43125 cm


Record Id: nmah_997197

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