John Larson's original polygraph, a gift to the Smithsonian ... By the spring of 1921, Larson unveiled the machine he called a cardio-pneumo-psychogram, and later simply a polygraph, a nod to ...

In the first decades of the 20th century, three men — police officer John Larson, psychologist William Marston and Larson’s assistant Leonarde Keeler — claimed the polygraph could detect a ...

Ames offered his assessment of the polygraph machine in a letter from prison ... a Berkeley police officer named John Larson, who also had a PhD in psychology, would later turn on his invention ...

"This is a simple lie detector," one of the agents informs him, gesturing toward a machine scribbling away ... Mackenzie and the police officer John Augustus Larson — over the course of decades ...

That officer, John Larson, was inspired by the work ... departments across the country. Although the polygraph was initially hailed as a machine that could tell if a person was telling the truth ...

His interests dovetailed with those of John A. Larson ... Larson unveiled the machine he called a cardio-pneumo-psychogram, ...

The man credited with fully developing the polygraph, a Berkeley police officer named John Larson, who also had a PhD in psychology, would later turn on his invention as unreliable, according to ...