Locke Level
notes: label: Description
content: 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.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Surveying and Geodesy
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content: Measuring & Mapping
creditLine: label: Credit Line
content: John William Christopher Draper and James Christopher Draper
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.333969
label: catalog number
content: 333969
label: accession number
content: 304826
objectType: label: Object Name
content: Locke Level
label: Object Name
content: locke level
physicalDescription: label: Measurements
content: overall: 7 3/4 in x 3/4 in; 19.685 cm x 1.905 cm
label: Measurements
content: 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