5.5K views · 175 reactions | Happy #HandwritingDay! Thomas Jefferson wrote roughly 19,000 letters during his lifetime and used this device, the polygraph, to create copies of his correspondence. The polygraph worked by having the writer's hand move one pen while a second pen mirrored its movements. The result was a copy strikingly like the handwritten original. Check out the video to learn more! | Thomas Jefferson's Monticello | Facebook
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Jefferson described the Polygraph copying machine, "the finest invention of the present age." Monticello guide Charles Morrill, who's been working on reproductions of various versions of the Polygraphs Jefferson owned, describes the device's importance to Jefferson. | Thomas Jefferson's Monticello
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7 things invented or popularized by Thomas Jefferson
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50K views · 1.3K reactions | The fact that Thomas Jefferson had children with his slave Sally Hemmings was denied by Jefferson's family for almost 2 centuries–until DNA evidence confirmed it. A descendent of Jefferson and Hemmings learns the details of the story. A new episode of One Thousand Years of Slavery airs this Monday at 8 PM. #1000YearsOfSlavery | Smithsonian Channel | Facebook
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