US Patent: 71,279
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| Improvement in Adjustable Spirit Levels
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Patentee:
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| Patrick Clifford (exact or similar names) - Holyoke, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Nov. 26, 1867 |
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Patent Pictures:
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Patrick Clifford Pat. Nov. 26, 1867 |
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Stan Schulz
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Description: |
| The level bubble is mounted on a swivel plate which is adjustable and calibrated so it could be reset to any pre-determined angle in relation to the straight-edge base on which it is mounted. This is an improvement on Clifford's June 11, 1867 patent (no. 65,726). |
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