Locke Hand Level

Locke Hand Level

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Usage conditions apply
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.
The inscription on this example reads "DIETZGEN."
Currently not on view
Object Name
hand level
Eugene Dietzgen Company
case: 7 3/4 in x 1 3/4 in x 1 1/4 in; 19.685 cm x 4.445 cm x 3.175 cm
object: 5 in x 1 1/4 in x 1 in; 12.7 cm x 3.175 cm x 2.54 cm
overall in pouch: 6 3/4 in x 2 in x 1 1/2 in; 17.145 cm x 5.08 cm x 3.81 cm
ID Number
catalog number
accession number
Credit Line
LaVerne Watkins
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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