US Patent: 397,043 - Spirit Level


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US Patent: 397,043

Spirit Level

Patentee:

Rodolphus D. Werden (exact or similar names) - Cincinnati, OH

USPTO Classifications:

33/348, 33/379

Tool Categories:

layout tools : levels

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

J. S. Zerbe

Robert Kirk

Patent Dates:
Applied:	May 18, 1888
Granted:	Jan. 29, 1889

Patent Pictures:

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Description:

Spirit vial reading is made more visible by chamfering the level stock opening around the vial. Text also mentions the use of slightly colored alcohol but does not claim this as new.