Quadratic interpolation in tapped-potentiometer function generators

The paper describes a method of obtaining quadratic interpolation in a tapped-potentiometer generator for functions of a single variable. The method depends on the quadratic form of the variation of resistance to earth at the slider, across which is developed the voltage necessary to reproduce correctly the first three terms of the Taylor´s series. The supply to the tapping points from voltage sources of zero and finite resistance is analysed, and the problem of supplying these voltages is examined. The application of the method to the generation of functions of two variables is briefly discussed.