Abstract

There is a large class of problems in geophysical interpretation which is solved by the integral over a plane surface of the product of an observed field value or an assumed surface density of some characteristic property F by a weighting function W. Use of a trigonal coordinate system and substitution of finite sums for the infinite integrals leads to a particularly useful form of adequate practical accuracy, for calculation by punched card methods.The geophysical interpretation problems to which this attack applies will be listed, and an illustration will be given of the calculation of the second vertical derivative of magnetic total intensity by employment of the widely available I.B.M. punched card machines.

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