Electrical Instruments for Determining the Moisture, Temperature, and Soluble Salt Content of Souls (Classic Reprint) - Softcover

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Excerpt from Electrical Instruments for Determining the Moisture, Temperature, and Soluble Salt Content of Souls

The determination of the water content of soils in place by means of the variation in the electrical resistance was first investigated by Prof. Milton Whitney in 1887. He first attacked the problem by meas urin g the variation in the internal resistance of an earth battery, con sisting of alternate copper and zinc plates buried in the soil. This method was found not to be satisfactory on account of the polarization of the plates. Measurements of the resistance between large copper plates buried at' the desired depth were next made with a direct cur rent, but polarization again interfered seriously. The Kohlrausch bridge method, employing alternating currents, was finally successfully used, and various forms of electrodes were tested, difficulty being experienced at that time in maintaining good contact between the electrodes and the soil.

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