Surveyor's Vernier Compass

Surveyor's Vernier Compass

<< >>
Usage conditions apply
Downloads
Description
This "Bate London" inscription on this unusual surveyors compass refers to the London instrument maker, Robert Brettell Bate (1782-1847). The outer edge of the face is graduated to 10 degrees, and numbered from north and south. The rim is graduated to single degrees, numbered counterclockwise from north, and read by vernier to 6 minutes.
Unlike most vernier compasses, this one has no variation arc. And unlike most surveyor's compasses, here the sight vanes are attached to the arms, and the arms screw onto the compass box. A level vial is also mounted below the compass box, and a socket, so that the compass can be used with a jacob staff.
Location
Currently not on view
Object Name
Surveyor's Compass
surveyor's compass
maker
Bate, Robert Brettell
place made
United Kingdom: England, London
Measurements
overall: 15 in x 5 1/2 in; 38.1 cm x 13.97 cm
overall: 8.8 cm x 17 cm x 17 cm; 3 7/16 in x 6 11/16 in x 6 11/16 in
overall in case: 3 3/8 in x 6 7/8 in x 6 3/4 in; 8.5725 cm x 17.4625 cm x 17.145 cm
ID Number
PH.319793.1
accession number
239772
catalog number
319793.1
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Surveying and Geodesy
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.

Comments

Add a comment about this object