US Patent: 230,619
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| Graduated Measuring Rule
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Patentee:
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| Samuel Darling (exact or similar names) - Providence, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 11, 1880 |
| Granted: |
Aug. 03, 1880 |
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Russ Allen.
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Description: |
| Metallic ruler with 45 degrees as the angle between the legs instead of the standard 60 degree construction. Also a line of pricks at an angle with the lines of graduation to allow divider to be set. Darling later references this patent in the text of patent 289,512. |
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