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- Briggs, Isaac (1)
- Jefferson, Thomas (1)
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| No. | Author | Recipient | Title | Date | Context |
|---|---|---|---|---|---|
| 1 | Jefferson, Thomas | Memorandum Books, 1805 | ≈1805-01-01 | ...him was what would be called today a circumferentor; it was eight inches in diameter and... | |
| 2 | Briggs, Isaac | Jefferson, Thomas | To Thomas Jefferson from Isaac Briggs, 31 October 1805 | 1805-10-31 | ...capable of ascertaining a course by the Circumferentor and of running and measuring a straight... |