Thomas Jefferson's polygraph used to write an original + a copy of letters simultaneously made by Hawkins & Peale at National Museum of American History. Washington, DC.

Thomas Jefferson's polygraph (c1803) used to write an original + a copy of letters simultaneously made by Hawkins & Peale at National Museum of American History. Washington, DC.

Thomas Jefferson's polygraph (c1803) used to write an original + a copy of letters simultaneously made by Hawkins & Peale at National Museum of American History. Washington, DC.
Photo by Jim Steinhart © 2013, all rights reserved. (Ref: DCMI0301)

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National Museum of American History, Presidential Collection, Washington, DC