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American inventor Leonarde Keeler testing his improved polygraph on Arthur Koehler, a former witness for the prosecution at the 1935 trial of Richard Hauptmann. A polygraph, often incorrectly referred to as a lie detector test, [1] [2] [3] is a pseudoscientific [4] [5] [6] device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration ...
A Polygraph is a duplicating 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 ...
Leonarde Keeler (October 30, 1903 – September 20, 1949) was an American inventor best known for co-inventing the polygraph.He was named after the polymath Leonardo da Vinci, and preferred to be called Nard.
John Augustus Larson (11 December 1892 – 1 October 1965) was a police officer and forensic psychiatrist and became famous for his invention of the modern polygraph device used in forensic investigations. [1] He was the first American police officer with an academic doctorate and to use the polygraph in criminal investigations.
William Moulton Marston (May 9, 1893 – May 2, 1947), also known by the pen name Charles Moulton (/ ˈ m oʊ l t ən /), was an American psychologist who, with his wife Elizabeth Holloway, invented an early prototype of the polygraph.
One of the polygraphs used by Thomas Jefferson, a portable version. In document duplication (as opposed to law enforcement and such), a polygraph is a mechanical device that moves a second pen parallel to one held by a writer, enabling the writer to make a duplicate of a document as it is written.
Invented and obtained a patent in 1803 for the polygraph, a mechanism for producing a duplicate copy while a handwritten original was created. This is credited with being the first autopen . [ 30 ] Charles Willson Peale made the first, and sold it to Benjamin Henry Latrobe .
Chromograph, Copygraph, Polygraph; Flexography; Spirit duplicator (also Rexograph, Ditto machine, Banda machine, or Roneo) Lithographic processes Transfer lithography; Anastatic lithography; Autographic process; Offset lithography; Photolithography; Stencil-based copying methods Papyrography; Electric pen, invented by Thomas Edison; Trypograph ...