Polygraph
Videos
A polygraph, often incorrectly referred to as a lie detector, is a device that measures and records several clinical biomarkers, such as blood pressure, pulse, respiratory rate, and skin conductivity,
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 being administered as part of the Manhattan Project, c. 1945
Demonstrating the administration of the polygraph, the polygrapher making notes on the readouts. 1970s
Brochure of the Defense Security Service (DSS) about polygraph testing
William Moulton Marston
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William Moulton Marston, also known by the pen name Charles Moulton, was an American psychologist who, with his wife Elizabeth Holloway, invented an early prototype of the polygraph. He was also known
Polygraph
…Vittorio Benussi used to measure breathing, the Mackenzie-Lewis Polygraph first developed by James Mackenzie in 1906 and an abandoned project by American William Moulton Marston which used blood pressure to examine German prisoners of war (POWs). Marston said he found a strong positive correlation between systolic blood pressure…
William Moulton Marston in 1938
William Marston (right) in 1922, testing his lie detector invention