Gurley Surveyor's Vernier Compass

Description
The rim of this 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 seconds. There is an outkeeper on the south arm, and two level vials on the north. The hand-engraved signature indicates a date of manufacture between 1852 and 1876. New, it cost $50.
The compass is equipped with a telescope that attaches to one of the sight vanes, and that is marked "W. & L. E. GURLEY, TROY, N.Y. PATENTED JULY 9, 1878." The reference is to patent #205,712 describing an Improvement in Telescope Attachments for Surveyors’ Compasses, and granted to William Gurley and Lewis E. Gurley.
Ref: W. & L. E. Gurley, A Manual of the Principal Instruments Used in American Engineering and Surveying (Troy, N.Y., 1871), pp. 23-27.
W. Skerritt, "W. & L. E. Gurley's Engraving Machine," Rittenhouse 11 (1997): 97-100.
Location
Currently not on view
Object Name
surveyor's vernier compass
maker
W. & L. E. Gurley
Measurements
overall length: 15 1/2 in; 39.37 cm
needle: 6 in; 15.24 cm
place made
United States: New York, Troy
ID Number
PH*335210
catalog number
335210
accession number
317998
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
Credit Line
Columbia University
cited
W. & L. E. Gurley. Manual of the Prinicipal Instruments Used in American Engineering and Surveying; 17th Edition
Additional Media

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Image CAPTCHA
Enter the characters shown in the image.