US Patent: 423,484
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| Inclinometer
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Patentee:
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| William Martin (exact or similar names) - Salem, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 13, 1889 |
| Granted: |
Mar. 18, 1890 |
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Ralph Brendler
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Description: |
| This is an attachment to a standard level to allow it to be used as an inclinometer. The patent drawings show siginificant modifications made to a level to allow it to fold up, but the claims mention that it is designed to be used with a standard level. |
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