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Hawkins Polygraph, 1803
Photograph - Digital Image
HAWKINS' POLYGRAPH, 1803. John Isaac Hawkins' polygraph which he invented in 1803. Thomas Jefferson acquired the letter-copying device in 1804. Contemporary English line engraving.
June 30th, 2012
Viewed 32 Times - Last Visitor from Joliette, QC - Canada on 11/26/2014 at 11:44 PM
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