Polygraph Machine – A History

In early China, a part of rice spit from someone’s mouth shown whether she or he was lying. Spitting dry rice out suggested the dry mouth of a liar.


In Europe, as a way of compelling someone to tell the truth, torture was utilized through the middle Ages. Ken Adler’s article To Tell the Truth: The Polygraph Examination and The city of Valencia the custom of torture was rooted in the theory that “the body’s misery would oblige the lying mind to croak out its secret.”

The allowance for torture in Europe fell throughout the eighteenth century. In the early 1700s, Daniel DeFoe was the very first to move from torture by implying that deceit may be assessed by monitoring one’s heart rate. Cesare Beccaria, in 1764, wrote of torture, “By this process, the solid will escape, as well as the weak be condemned. All these will be the annoyances of the pretended test of truth.”

Today, he’s a first man to make use of poligrafo.com.es as a way of detecting deceit. Lombroso used apparatus called the plethysmograph and the sphygmograph. An air-tight volumetric glove that has been attached to a rubber membrane was worn by the suspect. This activated a pencil that rolled on the top of a drum that was smoked. The suspect’s blood flow was changed using by the rate of the pencil. Lombroso believed that, when someone tells a lie, the strain of deceit changes her or his pulse and blood pressure. By finding the deviations followed by the pencil, a researcher would see in the event the suspect was lying and when.

Another advance came in 1897, when B. Decal developed a system of quantifying the quantity of perspiration a defendant generated during interrogation. The electric conductibility of the defendant’s skin discovered this.

The first “polygraph” machine was really a copy machine devised in 1804. The name, derived from Greek, means “many writings”. In the early 1900s, James MacKenzie, an English physician, devised what he called the “ink polygraph”. This is utilized to track cardiovascular reactions by measuring blood and pulse pressure.