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A bstract A fast computer‐procedure giving the apparent resistivity curve as well as the partial derivatives with respect to the layer‐parameters is presented. It is based on the linear filter method developed by D. P. Ghosh in 1971. The sampling frequency is 10 points per decade, and 3 decades are covered. The maximum relative error is less than 10 −3 , and in most cases orders of magnitude smaller. The computation time on a CDC 6400 for one curve given in 30 points ranges linearly from .17s for a two‐layer case to .36s for a ten‐layer case. The procedure is used to plot master curves interactively on a graphic display terminal (Tektronix 4010) connected to the CDC 6400. By trial‐and‐error adjustments a set of layer‐parameters is found, giving essentially the measured curve.
H. K. JOHANSEN (Mon,) studied this question.