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US Patent: 48,454
Improvement in Rulers
Patentee: S. L. Simpson (exact or similar names) - New York, NY USPTO Classifications: 33/431 Tool Categories: rules layout tools : protractors Assignees: None Manufacturer: Not known to have been produced Witnesses: Wm. Greurn C. L. Topliff M. M. Livingston	Patent Dates: Granted: Jun. 27, 1865 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is an improvement on Henry Taylor's earlier patent ( #48,454 - December 20, 1864). which adds a spring-loaded sliding stop to the compass arm.

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