US Patent: 7,263
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| Fluid Level
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Patentee:
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| William G. Ladd, Jr. (exact or similar names) - Cambridge, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Apr. 09, 1850 |
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Ralph Brendler
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Description: |
| This is the earliest patent I can find for an inclinometer. It uses a hermetically sealed disk half-filled with quicksilver (mercury), with a needle floating on it. The outer rim of the disk is marked with degrees.
My guess is that the inventor here was one of the namesakes of the Homers & Ladd company, since one of the witnesses for patent #7,257, issued on the same date and assigned to Homers & Ladd, also witnessed this patent.
From the 1886 book, "Federal Decisions, Vol. XXV. Patents, Copyright and Trade-marks": In interference, Chandler v. Ladd, 1 Mac A. Pat. Cases, 493. |
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