A method useful in electrical exploration is presented. In electrical profiling using a sensitive low frequency instrument, a considerable variety of information can be obtained at relatively small expense by making a suitable choice of electrode patterns for three measurements at each station along a profile. Apparent resistivities pertaining to relatively large electrode spreads can be computed from shorter spread measurements along a profile, and a variety of potential drop ratios can also be computed. Suitable instrumentation should afford automatic recording of a variety of electrical functions in continuous profiling at or near the surface of the earth, and in bore holes.

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