The Electrical Method of Moisture Determination in Soils: Results and Modifications in 1897 (Classic Reprint) - Softcover

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Excerpt from The Electrical Method of Moisture Determination in Soils: Results and Modifications in 1897

In very light, sandy soils, having a low salt content and small water capacity, the resistance of the soil with the ordinary form of electrode with two strips of carbon is sometimes very high, and in dry periods is liable to extend beyond the capacity of the measuring box. In such cases it is well to add several extra carbon plates to the electrode, separating them about a quarter of an inch from the other plates by glass rods. Where the electrode is composed of several plates, the alternate ones are joined together with a short 'piece of wire soldered to each. This will give several paths for the electric current, and will lower the resistance. If it be found that the electrode thus con structed gives too low a resistance, one of the wires can simply be cut and one or more of the carbon plates cut For the surface of very dry, sand y soils electrodes bavin g as many as six or eight carbon strips have been used with great success.

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