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A study has been made of the electrical properties of wet granular materials. Variations of conductance and capacitance with moisture content are given for a capacitor containing samples of coal, sand, gravel, soil and glass beads. The effects of material packing on these variables have also been studied. The use of these data in designing an electrical moisture meter has been considered, and the performance of such a meter, used with a specially designed "fringe field" capacitor to monitor the moisture content of a stream of coal leaving a drying tower, is described.
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D J Millard (1953) studied this question.
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