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The Polygraph


Submitted By chan35
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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.


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


The Model 6308 shown here was manufactured by 'Keeler Polygraph' which was a division of 'Associated Research' of Chicago, Illinois. This instrument was used in the late 1960's, initially in the Military, and continued being used until the late 1970's in some States. The Model 6308 is one of the first instruments that can easily be changed from a desk mount to a portable unit without tools. The instruments three separate channels provide continuous recording of changes in heart rate and blood pressure, breathing rate and skin resistance. The G.S.R. component consisted of a pair of finger electrodes, or a hand electrode connected to a input circuit of a direct couple solid-state amplifier with a balanced differential output, feeding the pens.
The 6308 utilized a newly designed epoxy encapsulated printed circuits that assured long, trouble-free operation, and like the Model 6318, operated on four nickel cadmium batteries which were automatically recharged when the instrument was plugged into AC current. The Model 6308 is 18" x 9" x 6" and weighs approximately twenty pounds with its accessories.

The 'Keeler Polygraph' Model 302 shown here is one of Keeler' earlier instruments, dating back to 1953. This instrument was manufactured by 'Associated Research' of Chicago, Illinois and utilizes seven batteries, along with an AC power source. It is housed in a steel case with wrinkle finish and chromium trim. The cover is attached to the case with slip hinges allowing the cover to be removed.
The chart drive unit is powered by a synchronous motor at speeds of either six or twelve inches per minute. There are four recording pens, the lower pen and its associated controls comprise the pulse-blood pressure unit, while the longer pen records electrodermal variations. Located above the electrodermal pen is the pen for recording respiration changes, and at the top of the panel is the stimulus marker pen actuated by means of a flexible cable attached at the lower left of the panel. At the center of the panel is a standard sphygmomanometer, used as a guide to proper inflation of the blood pressure cuff.

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