- John Locke, a 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 consisted 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 example belonged to the Anglo-American physician and scientist, William Draper (1811-1882), or one of his descendants.
- Currently not on view
- Object Name
- Locke Level
- locke level
- 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
- catalog number
- accession number
- Credit Line
- John William Christopher Draper and James Christopher Draper
- Data Source
- National Museum of American History
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.