Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 124 C. A. H EI LAND o'^ II — r- ~ :— J»> rs) O.«3^i»aa0i0^0>0>o k> »R # & N d? ms^^mm f/ *v 0IP Fig. 176.—Curve of apparent resistivity for case of Ai = 3Aand ratio p:pi:pt 1:3:0 (after Hummel). 454

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