The ABC conjecture and prime divisors of the Lucas and Lehmer sequences

A simple electrometer system particularly adapted for non-contact measurement of electrostatic charges in electrostatography, such as the charge level on photoreceptor surface areas in commercial xerographic machines. Structure for readily mounting the electrometer as a desired measurement position immediately prior to image development in such machines is disclosed. Stable, long term and very high resistance induced electrostatic charge retention and accurate measurement thereof is provided by a simple disclosed electrometer circuit utilizing only a few commercially available electronic components including a single semi-conductive active element. The circuit output can be read by a conventional test meter, or utilized for various machine controls. The electrometer is controlled by a simple rotary switching arrangement.

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