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US Patent: 297,574
Spirit Level
Patentee: Leonard L. Davis - Springfield, MA USPTO Classifications: 33/385 Tool Categories: layout tools : levels : metallic levels Assignees: None Manufacturer: Not known to have been produced Witnesses: Wm. H. Chapin J. D. Garfield	Patent Dates: Applied: Mar. 10, 1884 Granted: Apr. 29, 1884 Patent Pictures: USPTO pdf tiff Google Patents Report data errors or omissions
Description: Four screws are used to hold and when necessary adjust the level spirit vial.

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