By means of a finite difference expansion a fluid flow field in cylindrical coordinates with axial symmetry, is simulated by a network of electrical resistors. A series of DC analog computing units, connected to the network boundary corresponding to the free surface effectively adjust the network parameters to satisfy simultaneously Laplace's equation and the bcundary conditions. The system automatically "relaxes" to the correct boundary shape in a fraction of a second. A detailed application

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... the method to the water coning problem in oil wells is presented.