The museum is open Fridays through Tuesdays 11 a.m. to 4 p.m. Free timed-entry passes are required. Review our latest visitor safety guidelines.

Locke Level

Locke Level

<< >>
Usage conditions apply
Downloads
Description
John Locke, a physician and scientist in Cincinnati, Ohio, described a reflecting level at a meeting of the Association of American Geologists and Naturalists in 1842, and obtained a patent (#7,477) in 1850. Locke's instrument consists of a small spirit level on a brass sighting tube, with a small diagonal reflector so arranged that the user can see the bubble and a distant sight at the same time. This simple and perhaps homemade Locke level belonged to the Anglo-American physician and scientist, William Draper (1811-1882), or one of his descendants.
Location
Currently not on view
Object Name
Locke Level
Measurements
overall: 7 3/4 in x 3/4 in; 19.685 cm x 1.905 cm
overall: 7 3/4 in x 1 3/16 in x 7/8 in; 19.685 cm x 3.01625 cm x 2.2225 cm
ID Number
PH.333969
catalog number
333969
accession number
304826
Credit Line
John William Christopher Draper and James Christopher Draper
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