Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 ADVANCES IN OIL PROSPECTING *33 the electrode in C is left there and the electrode which was at B is moved to a next point, say D, which has the same distance from C, as B has from C. The curves shown in Figure 33 have been obtained in this manner. The method is not very accurate, as the surface and con- tact resistances enter considerably. â WWVkWVi rvVWVW/W m U Â -oro- 2l_

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