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US Patent: 252,410
Calipers
Patentee: Leslie B. Woodruff (exact or similar names) - Chicago, IL USPTO Classifications: 33/558.02 Tool Categories: layout tools : calipers Assignees: Leslie B. Woodruff - Chicago, IL James Shaw - Aurora, IL James B. Hopkins - Aurora, IL Manufacturer: Not known to have been produced Witnesses: Geo. R. Custer Thomas H. Pease W. C. Corlies Alice Hollister	Patent Dates: Applied: May 17, 1881 Granted: Jan. 17, 1882 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: These calipers are constructed such that when one set of points measure a circle's diameter, the other points are set to the circle's circumference.

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