Abstract
A simple electrical meter has been devised for estimating the moisture content of grain. It accommodates a 190 gm. sample which forms the dielectric of a condenser in the plate tuning circuit of a triode crystal oscillator. An increase in the dielectric constant due to moisture in the sample is compensated for by removing capacity from a variable condenser attached to the dial of the instrument. A piezoelectric plate determines the frequency at which the triode section of the tube will oscillate, and this state is indicated by a change in the shadow angle of the indicator section of the same tube. The meter has been calibrated with 159 samples of Canadian hard red spring wheat; the standard error of estimate was found to be 0.36 over the range from 10 to 17% moisture.
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