From: eastin@locus.com (Dick Eastin)
Newsgroups: alt.religion.scientology
Subject: Re: Scientology questions
Message-ID: <1991Jul25.043119.2479087@locus.com>
Date: 25 Jul 91 04:31:19 GMT
References: <1991Jul24.021125.714438@locus.com> <1991Jul24.060051.23070@Csli.Stanford.EDU>
Distribution: alt.religion.scientology
Organization: Locus Computing Corp, Los Angeles
Lines: 53

More on the E-meter: Yes, the Wheatstone bridge is the basis for electrical measurement. One arm of the bridge contains the "subject" and the balancing arm contains a gross adjustment potentiometer. The bridge output is fed to a high-gain, temperature compensated amplifier, with a gain (sensitivity) control and a taut band microampmeter on the output. The book, "Understanding the E-meter" covers theory of operation from the thetan, mind, physical universe point of view. The book, "The Book of E-Meter Drills" covers the operator training for use in monitoring thought and change of mental state.

I doubt if the specification is available. For the cost of an older used E-meter to experiment with it wouldn't be worth the time to build one yourself. There are three current versions, called the Mark V, VI, and VII. The V would be the cheapest. This would also allow verification of the inards, taking into account a steady increase in quality since 1953.

The general specification, recalled from a time when I made a crude facsimile of the even older Mark IV, is as follows: The gross adjustment pot. refered to above is called the Tone Arm, for historical reasons, which needn't be explained now. The adjustment range is 0 to infinity ohms. It is an approximate straight line on a log-linear plot, with some curve at both ends, making the plot look like a flattened S. The very rough values of the curve are: .5 1 2 3 4 5 6 6.5 Tone Arm scale 0 ~.5K 5K 12.5K ~.1M ~1M ~50M open ohms The values for 2 and for 3 are exact, for .5 and 6.5, almost exact and the others I guessed at from memory.

The sensitivity scale is 1 to 128. One represents one full dial width on the meter for 1 whole division of the tone arm. Thus 128 would be 1/128th of a division of tone arm for one full meter dial width of needle motion.

How the body surface resistance, or galvanic skin effect is dealt with is too much to cover here. If you experiment around you will see the differences between thought/mental factors and body factors. In training counselors to use E-meters properly there is a reference called High-Lo Tone Arm Checklist, covering how to deal with wet, dry, dirty, calloused, etc. hands.


Two descriptive definitions for the E-meter: "The E-meter is a religious artifact used as a spiritual guide in the church confessional. It is an aid to the auditor (minister, student, pastoral counselor) in two-way communication locating areas of spiritual travail and indicating spiritual well-being in an area. An electronic instrument for measuring mental state and change of state in individuals, as an aid to precision and speed in auditing (counseling). The E-meter is not intended or effective for the diagnosis, treatment, or prevention of any disease." (Def 1 & 2 from the Dianetics and Scientology Technical Dictionary.)

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