Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 102 C. A. H EI LAND of such an arrangement (Sundberg, ref. list No. I9) shows that for square electrodes with sides of cm. the measured resistance is equal to the specific resistance of the specimen. The bridges described before may only be used for solid speci- mens. They are not applicable for soils. For testing of soil samples in Fig. 4a.—Circuit of rock-resistivity tester, operated from light socket (after M. W. Pullen). Bridge Wire

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