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- Polygraph_(duplicating_device) 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 in 1803, it was most famously used by the third U.S. president, Thomas Jefferson, who acquired his first polygraph in 1804, later suggesting improvements to Charles Willson Peale, owner of the American rights. As a prolific letter writer, the preservation of Jefferson's 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.".
- Polygraph_(duplicating_device) thumbnail JeffersonPolygraphReproductionFrontView.jpg?width=300.
- Polygraph_(duplicating_device) wikiPageExternalLink vc59.1.jpg.
- Polygraph_(duplicating_device) wikiPageExternalLink TJ.html.
- Polygraph_(duplicating_device) wikiPageExternalLink 2216029.
- Polygraph_(duplicating_device) wikiPageExternalLink Polygraph.
- Polygraph_(duplicating_device) wikiPageExternalLink monticellos-makeover.
- Polygraph_(duplicating_device) wikiPageExternalLink jeflxx.htm.
- Polygraph_(duplicating_device) wikiPageExternalLink 8griffin_room.html.
- Polygraph_(duplicating_device) wikiPageExternalLink home.html.
- Polygraph_(duplicating_device) wikiPageExternalLink polygraph.html.
- Polygraph_(duplicating_device) wikiPageID "24877113".
- Polygraph_(duplicating_device) wikiPageRevisionID "599058521".
- Polygraph_(duplicating_device) hasPhotoCollection Polygraph_(duplicating_device).
- Polygraph_(duplicating_device) subject Category:Printing.
- Polygraph_(duplicating_device) subject Category:Technical_drawing.
- Polygraph_(duplicating_device) 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 in 1803, it was most famously used by the third U.S. president, Thomas Jefferson, who acquired his first polygraph in 1804, later suggesting improvements to Charles Willson Peale, owner of the American rights.".
- Polygraph_(duplicating_device) label "Jefferson-Polygraph".
- Polygraph_(duplicating_device) label "Poligrafo di Jefferson".
- Polygraph_(duplicating_device) label "Polygraph (duplicating device)".
- Polygraph_(duplicating_device) sameAs Jefferson-Polygraph.
- Polygraph_(duplicating_device) sameAs Poligrafo_di_Jefferson.
- Polygraph_(duplicating_device) sameAs m.09gn4lw.
- Polygraph_(duplicating_device) sameAs Q1686381.
- Polygraph_(duplicating_device) sameAs Q1686381.
- Polygraph_(duplicating_device) wasDerivedFrom Polygraph_(duplicating_device)?oldid=599058521.
- Polygraph_(duplicating_device) depiction JeffersonPolygraphReproductionFrontView.jpg.
- Polygraph_(duplicating_device) isPrimaryTopicOf Polygraph_(duplicating_device).
