US Patent: 50,980
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Improvement in Parallel Rulers
Rolling Rule
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Patentee:
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| W. L. Woods (exact or similar names) - Washington, DC |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Nov. 14, 1865 |
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Ralph Brendler
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Description: |
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This is a simple parallel rule for navigation, which uses one or more rolling
bars instead of the traditional twin ruler setup. In addition, these bars
are graduated with one or more scales to allow them to not only mark parallel
lines, but to measure the distance between them as well.
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