US Patent: 129,183
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| Improvement in adjustable spirit-levels
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Patentees:
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| Charles M. Stratton (exact or similar names) - Greenfield, MA |
| Edwin A. Stratton (exact or similar names) - Greenfield, MA |
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Patent Dates:
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| Granted: |
Jul. 16, 1872 |
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Patent Pictures:
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Jeff Joslin
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Description: |
| Previous spirit levels had a vial that was adjustable so as to fine-tune the level setting. This patent covers an indicator that is attached to a slide that is moved to adjust the level setting, and then fixed in place with a screw. |
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