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US Patent: 82,514
Improvement in Calipers
Patentee: Thomas Goodrum (exact or similar names) - Providence, RI USPTO Classifications: 33/558.06 Tool Categories: layout tools : calipers Assignees: None Manufacturer: Not known to have been produced Witnesses: James Wilson Wm. Hancock John G. Thurston Charles L. Spencer	Patent Dates: Granted: Sep. 29, 1868 Antedated: Sep. 16, 1868 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This caliper uses a tapered worm gear registering against a rack machined in the bottom of the arc.

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