US Patent: 54,626
|
Improvement in Spirit-Levels
|
Patentee:
|
|
Andrew J. Vandegrift (exact or similar names) - Cincinnati, OH |
|
Patent Dates:
|
Granted: |
May 08, 1866 |
Antedated: |
Apr. 25, 1866 |
Patent Pictures:
[
1 | 2 | 3 | 4 | 5
]
|
|
|
USPTO (New site tip) Google Patents
Report data errors or omissions to steward
Ralph Brendler
|
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. |
|