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Polygraph
Polygraph
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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
2:19
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
5.5K viewsJan 23, 2019
FacebookThomas Jefferson's Monticello
Thomas Jefferson was a founding father of the United States — but were his principles outweighed by his participation in a greater injustice? Put this controversial figure on trial and decide for yourself: | TED-Ed
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