US Patent: 431,484
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Protractor
Folding Draftsman's Triangle
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Patentee:
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| Justus Roe (exact or similar names) - Patchogue, NY |
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Patent Dates:
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| Applied: |
Mar. 22, 1890 |
| Granted: |
Jul. 01, 1890 |
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Patent Pictures:
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1 | 2
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Ralph Brendler
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Description: |
| This is an unusual design for a drafting triangle, featuring four articulating arms attached to a central scale. In addition to the normal 45 triangle, this tool can also be used to measure and transfer angles, or as a compass. |
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