A Second Undamped Wave Method of Determining Dielectric Constants

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Abstract
New Undamped Wave Method of Measuring Capacities, Changes of Capacity and Dielectric Constants.—A previously described method is very fatiguing, since it involves adjusting a beat tone produced by two ultra-audion circuits, to the same pitch as that of a standard tuning fork. The new method involves merely reading galvanometer deflections, and depends upon the observation that under certain conditions the relation between current in plate circuit and capacity in the oscillating circuit is linear for a limited range, therefore three current readings, corresponding to an unknown and two known capacities, are sufficient to determine the unknown. Small changes of capacity, for instance 0.01 cm. in 1000 cm., can readily be detected and measured. The accuracy of the method is practically equal to that of the standards if sufficient care is taken to keep circuit conditions constant.

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