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US Patent: 1,427,493
Arc-Describing Instrument
Patentee: Forrest H. Murray (exact or similar names) - Cambridge, MA USPTO Classifications: 33/27.01 Tool Categories: layout tools : compasses Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 03, 1920 Granted: Aug. 29, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This design covers a new kind of draftsman's compass, which the inventor claims allows arcs of any diameter up to infinity to be accurately drawn.

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