The Polygraph

In: Social Issues

Submitted By chan35
Words 624
Pages 3
The Reid Polygraph

In 1945, John E. Reid of Reid and Associates in Chicago, Illinois developed what he called the “Reid Polygraph.” Besides recording blood pressure, pulse, respiration, and GSR, this new polygraph instrument recorded muscular activity in the forearms, thighs, and feet. These muscular movements were picked up from metal bellows under the arms and seat of the polygraph chair. This instrument was the first instrument to use a movement sensor to detect subject movement during the examination. The examiner in this picture is John E. Reid. It was manufactured by the C.H. Stoelting Company and was available only to examiners who were trained by John E. Reid and Associates.

KEELER POLYGRAPH MODEL 6338

The 'Keeler Polygraph' Model 6338 shown here was the first 'Plethysmic Polygraph' manufactured by 'Associated Research' of Chicago, Illinois in the early 1950's. This instrument is the first in the 'Pacesetter Series' which incorporated for the first time a integral photo/optical plethysmograph. The Model 6338 was introduced as a four channel instrument, which recorded simultaneously changes in relative blood pressure, heart rate, pulse wave amplitude, blood volume, oxygenation of the blood, respiration and electrical skin resistance. These reading are obtained by utilizing electronic and pneumatic monitoring.
The 6338 required a 115 volt AC current. It weighs twenty-four pounds and is 18" x 11" x 6". The 6338 incorporated newly designed printed circuits, and a new inking system where the pens are fed from removable, individually capped ink bottles with colored ink available. The newly designed vent valves have a positive lock to prevent leak

KEELER POLYGRAPH PACESETTER SERIES MODEL 6308

The Model 6308 shown here was manufactured by 'Keeler Polygraph' which was a division of 'Associated Research' of Chicago, Illinois. This instrument was…...

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