抄録
The purpose of this article is to describe the principle of a capacitance measuring circuit which uses two double resonant circuits.
The essential characteristics to be emphasized are that this circuit can be used to measure very small capacitance, say, down to 10-3 pF; and that, as a direct-reading capacitance meter it is least susceptible to the effect of the resistance component of the specimen.
Experimental results show that this circuit has many uses in industrial fields, especially in textile mills, as a moisture detector, a hygrometer, a tensionmeter and as their automatic controller. Some other interesting instances of its use are also described.
