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US Patent: 433,842
Builder's Plumb
Patentee:
William J. Workman - 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 pdf tiff
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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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