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- Q1686381 subject Q8833048.
- Q1686381 subject Q8921363.
- Q1686381 abstract "A Polygraph is a device that produces a copy of a piece of writing simultaneously with the creation of the original, using pens and ink.Patented by John Isaac Hawkins on May 17, 1803, it was most famously used by the third U.S. president, Thomas Jefferson, who acquired his first polygraph in 1804 and later suggested improvements to Charles Willson Peale, owner of the American rights. Because Jefferson was a prolific letter writer, the preservation of his copies have offered historians extensive insights into Jefferson's viewpoints and actions.Jefferson called the polygraph "the finest invention of the present age". A description of Jefferson's office routine in his own words may be read here.Another American, Benjamin Henry Latrobe was the first customer of Peale's and not only introduced the device to Jefferson but was also instrumental in its improvement.The quality of the copy made by a machine in good condition is so fine that it is considered by some that only characteristics other than the quality of the script (e.g., having been mailed, etc.) are reliable indicators (under the assumption that the original was mailed and not the copy), although a worn or maladjusted machine will produce specific indications in the copy.Mechanisms of this type are more generally known as pantographs, which include simple devices for making copies at various enlargements or reductions by tracing over a drawing.".
- Q1686381 thumbnail JeffersonPolygraphReproductionFrontView.jpg?width=300.
- Q1686381 wikiPageExternalLink vc59.1.jpg.
- Q1686381 wikiPageExternalLink TJ.html.
- Q1686381 wikiPageExternalLink 2216029.
- Q1686381 wikiPageExternalLink Polygraph.
- Q1686381 wikiPageExternalLink monticellos-makeover.
- Q1686381 wikiPageExternalLink jeflxx.htm.
- Q1686381 wikiPageExternalLink 8griffin_room.html.
- Q1686381 wikiPageExternalLink home.html.
- Q1686381 wikiPageExternalLink polygraph.html.
- Q1686381 wikiPageWikiLink Q11812.
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- Q1686381 wikiPageWikiLink Q726082.
- Q1686381 wikiPageWikiLink Q7695656.
- Q1686381 wikiPageWikiLink Q8833048.
- Q1686381 wikiPageWikiLink Q8921363.
- Q1686381 comment "A Polygraph is a device that produces a copy of a piece of writing simultaneously with the creation of the original, using pens and ink.Patented by John Isaac Hawkins on May 17, 1803, it was most famously used by the third U.S. president, Thomas Jefferson, who acquired his first polygraph in 1804 and later suggested improvements to Charles Willson Peale, owner of the American rights.".
- Q1686381 label "Polygraph (duplicating device)".
- Q1686381 depiction JeffersonPolygraphReproductionFrontView.jpg.