Watch Thomas Jefferson | Ken Burns | PBS
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Polygraph
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5.5K views · 174 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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