The Polygraph: The Proto-Photocopy Machine Machine Invented in 1803 That Changed Thomas Jefferson’s Life
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5K views · 246 reactions | 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 | Facebook
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