The 'Berkeley Psychograph', or other wise known as the 'Lee Polygraph' shown here was first introduced in Chicago, Illinois in 1938. This instrument is the improved model, which was developed by Captain LEE of the Berkeley California Police Department.

This instrument was designed to be a compact, portable unit which encompasses a novel arrangement of rubber 'tambours' and a manually operated stimulus key. Visible are the pens for recording respiration, blood pressure, pulse and stimulus response changes. The instrument includes a pressure cuff and hand bulb, along with a pneumograph tube for recording respiration change. The major difference with the Berkeley Psychograph in comparison to the earlier Keeler instruments was that the Berkeley Psychograph incorporated a new design in the pulse-blood pressure unit. Captain LEE was also the first to introduce the use of the guilt complex control question, and the first 'Control Test', which was later re-named the Pre-Test.

This type instrument was used primarily on juveniles during the 1930's, as the conventional rules of evidence did not apply at this time. The 'Lee Polygraph' was taken out of service around 1938, after Dr. BRIL, a criminologist from New York City developed his own instrument, a "Brilograph', which measured changes in skin resistance, ie: G.S.R.


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