This polygraph instrument is one of the first production instruments produced by the Stoelting Company in Chicago, Illinois. This instrument was originally designed by Cleve Baxter, who presented his plans to the Stoelting Company, who made some minor design variations before it went into production in the early 1950's.

This instrument operated on a standard 115 volt current sixty cycle current, and did not have alternate battery capacity. It was considered to be very sensitive for its time, but only operated on a two pen inking system, recording pneumo and cardio tracings. The blood pressure gauge manufactured by Stoelting recorded pressure from zero to three hundred. The two pens recorded on six inch paper. The single Pneumograph was attached to the examinee by placing the small chrome cup directly over the subjects heart.

During the late 1950's, a polygraph examiner named R. Chattum used an instrument identical to this one in employee screening at the Atomic Energy Commission in Oakville, Tennessee.

The instrument displayed here was first used by the Abilene Police Department in 1955, and later used by one of the local Sheriff's department until 1970. This instrument was retired in September of 1981.

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