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US Patent: 1,889,897
Surface plate
Patentee:
Carl Edvard Johansson - Detroit, MI

USPTO Classifications:
33/567

Tool Categories:
layout tools : surface plates

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 18, 1930
Granted: Dec. 06, 1932

Patent Pictures:
USPTO pdf tiff
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Description:
The intent of the grooves on this surface plate is to reduce stiction as when a gauge blocks "wrings together" with the surface plate. This is a problem with very smooth and accurate cast iron surface plates, though not with granite plates.

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