- 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.
- Currently not on view
- Object Name
- 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
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