The auditor asks questions of the subject, and the movement of the needle is apparently used as a check of the emotional reaction to the questions. According to complex rules and procedures set out in Scientology publications, the auditor can interpret the movements of the needle after certain prescribed questions are asked, and use them in diagnosing the mental and spiritual condition of the subject. When this tiny flow is reduced due to increased resistance, the needle of the E-Meter movement moves off the dial to the left. This happens because the preclear pulls in mass. The tiny carrier wave becomes partially blocked.
Energy is energy.
Matter is condensed energy. This text is accompanied by three pictures. Perhaps the Scientologists who contribute to alt.religion.scientology can provide such references.