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

Considered the first step into the world of modern photocopying, the copying machine was among the first widely used devices to successfully produce an exact copy of an original written work. Designed and patented in 1780 by one of history’s greatest inventors, James Watt, the copying machine was the only device in the 18th century that was able to duplicate letters; this particular model was also among the first portable copying machines ever made.Visit our website for more details. Item No. 30