Today we assoÂciate the word polyÂgraph mainÂly with the devices we call “lie detecÂtors.” The unhidÂden Greek terms from which it origÂiÂnates simÂply mean “mulÂtiÂple writÂing,” which seems apt enough in light of all those movie interÂroÂgaÂtion scenes with their judÂderÂing parÂalÂlel neeÂdles. But the first “polyÂgraph machine” merÂitÂing the name long preÂdates such cinÂeÂmatÂic clichĂ©s, and indeed cinÂeÂma itself. PatentÂed in 1803 by an EngÂlishÂman named John Isaac Hawkins, it conÂsistÂed essenÂtialÂly of twin pens, mountÂed side-by-side and conÂnectÂed by means of levers and springs so as always to move in uniÂson. The result, in theÂoÂry, was that it would make an idenÂtiÂcal copy of a letÂter even as the writer wrote it.
“The polyÂgraph was pushÂing techÂnolÂoÂgy to the absolute limÂit,” but for years “it was nearÂly imposÂsiÂble to make it work corÂrectÂly.” So says Charles MorÂrill, a guide at Thomas JefÂferÂsonÂ’s estate MonÂtiÂcelÂlo, in the video above.
Despite the proÂlonged techÂniÂcal difÂfiÂculÂties, the third presÂiÂdent of the UnitÂed States of AmerÂiÂca fell in love with the polyÂgraph, “a device to dupliÂcate letÂters, just the thing if you’re carÂryÂing on mulÂtiÂple conÂverÂsaÂtions with difÂferÂent peoÂple all over the world. You want to keep a copy of the letÂter to catch yourÂself up, to see what you had writÂten to cause a response” — and, of speÂcial conÂcern to a nationÂal politiÂcian, to check on the exact degree to which the press was misÂquotÂing you.

Image by the SmithÂsonÂian, via WikiÂmeÂdia ComÂmons
JefÂferÂson wrote nearÂly 20,000 letÂters, one of them a comÂplaint to John Adams about sufÂferÂing “under the perÂseÂcuÂtion of LetÂters,” a conÂdiÂtion ensurÂing that “from sun-rise to one or two o’clock, I am drudgÂing at the writÂing table.” That the polyÂgraph reduced this drudgery someÂwhat made it, in JefÂferÂsonÂ’s words, “the finest invenÂtion of the present age.” Like techÂnoÂlogÂiÂcal earÂly adopters today, JefÂferÂson acquired each new modÂel as it came out, the device havÂing been conÂtinÂuÂalÂly retooled by AmerÂiÂcan rights-holdÂer Charles WillÂson Peale. By 1809 Peale had improved the polyÂgraph to the point that JefÂferÂson could write that it “has spoiled me for the old copyÂing press the copies of which are hardÂly ever legÂiÂble … I could not, now thereÂfore, live withÂout the PolyÂgraph.” ImagÂine how he would’ve felt had MonÂtiÂcelÂlo been wired for e‑mail.
RelatÂed ConÂtent:
Thomas Jefferson’s HandÂwritÂten VanilÂla Ice Cream Recipe
The First Music StreamÂing SerÂvice Was InventÂed in 1881: DisÂcovÂer the ThéâtroÂphone
Based in Seoul, ColÂin MarÂshall writes and broadÂcasts on cities, lanÂguage, and culÂture. His projects include the SubÂstack newsletÂter Books on Cities, the book The StateÂless City: a Walk through 21st-CenÂtuÂry Los AngeÂles and the video series The City in CinÂeÂma. FolÂlow him on TwitÂter at @colinmarshall, on FaceÂbook, or on InstaÂgram.





