A feed‐back method is described which is suitable for an automatic computer solving linear simultaneous equations and secular equations. This method is more general than is the Gauss‐Siedel method. The design for an analog computer based on this feed‐back method is outlined. This design utilizes resistive voltage dividers to represent coefficients and voltages to represent the variables. The variables are automatically adjusted by the feed‐back system. The performance obtained on a 4‐equation model is given. Usually an accuracy of better than one percent is obtained.