US Patent: 650,793
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| Rule
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Patentee:
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| William D. Jones (exact or similar names) - Homestead, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 04, 1899 |
| Granted: |
May 29, 1900 |
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Russ Allen.
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Description: |
| Designed to determine the radius of a circle. Inner edge is beveled where the scale on each inner leg is identical and the center point is the center of the hinge. When determining if the radius is correctly measured, the measurement on each inner leg is compared and if identical the rule is positioned correctly to measure the radius. |
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