US Patent: 54,626
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| Improvement in Spirit-Levels
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Patentee:
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| Andrew J. Vandegrift (exact or similar names) - Cincinnati, OH |
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Patent Dates:
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| Granted: |
May 08, 1866 |
| Antedated: |
Apr. 25, 1866 |
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Patent Pictures:
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Ralph Brendler
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Description: |
| This level uses an accurately-milled circular channel half-filled with liquid to provide a basic level, as well as a larger "circuitous" channel to provide a more accurate inidication of slight variances. Update: an inclinometer showed up on ebay with this patent date. Presuming it's this patent though it's quite different than the patent drawings. |
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