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US Patent: 433,842
Builder's Plumb
Patentee: William J. Workman (exact or similar names) - Toronto, ON Canada USPTO Classifications: 144/133.1, 33/393 Tool Categories: layout tools : plumb bobs Assignees: None Manufacturer: Not known to have been produced Witnesses: Charles C. Baldwin F. R. Cameron	Patent Dates: Applied: Sep. 30, 1889 Granted: Aug. 05, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Plumb bob system is designed to prevent the wind from affecting the reading by placing it in a recess with sides.

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