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US Patent: 459,648
Instrument for Describing Outlines of Objects
Patentee: William Potter (exact or similar names) - New York, NY USPTO Classifications: 33/41.5 Tool Categories: layout tools : scribes Assignees: None Manufacturer: Not known to have been produced Witnesses: J. F. Acker C. Sedgewick Donn Twitchell	Patent Dates: Applied: Jan. 15, 1891 Granted: Sep. 15, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a simplified version of the inventor's earlier design (450,892 - 4/21/1891) that does away with the springs in favor of a simple sliding arm.

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