US Patent: 1,889,897
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| Surface plate
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Patentee:
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| Carl Edvard Johansson (exact or similar names) - Detroit, MI |
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Patent Dates:
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| Applied: |
Dec. 18, 1930 |
| Granted: |
Dec. 06, 1932 |
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Jeff Joslin
Vintage Machinery entry for C. E. Johansson, Inc.
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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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