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US Patent: 1,212,194
Plumb-Bob
Patentee:
Archer F. Duguid - Montreal, QC Canada

USPTO Classifications:
33/392

Tool Categories:
layout tools : plumb bobs

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
S. R.W. Allen
G. M. Moreland

Patent Dates:
Applied: Jul. 26, 1913
Granted: Jan. 16, 1917

Patent Pictures:
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Description:
This plumb bob has a series of cutouts in it to allow light to shine through it. This supposedly makes it easier for surveyors to sight on the bob.

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