US Patent: 67,269
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| Improvement in Slides for Rules, Scales and Tables
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Patentee:
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| F. J. Coffin (exact or similar names) - Newburyport, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jul. 30, 1867 |
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Ralph Brendler
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Description: |
| This design is for a metal slider that can be used to accurately read from a rule or scale that has multiple scales printed on it. One of the patent pictures shows it being applied to a log rule, but it could also be used for a gunther scale or slide rule. |
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