US Patent: 111,715
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| Improvement in Compass-Joints
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Patentee:
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| Theodore Alteneder (exact or similar names) - Philadelphia, PA |
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Patent Dates:
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| Granted: |
Feb. 14, 1871 |
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Ralph Brendler
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Description: |
| This is an improvement to his 1850 compass patent (#7,501), which uses a bone disk between the legs to reduce friction.
Alteneder was a well-known manufacturer of drafting tools, but it is not known if tools using this design were ever produced by them.
Known examples marked with manufacturer name and patent date. |
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