Electric nonlinear computation performed by linear elements

THIS paper explains how nonlinear computation including inversion, determining powers, positive and negative roots, logarithms and antilogarithms; and obtaining the hyperbolic functions may be made by using simplified linear circuits. Such circuits may be fed with d-c or a-c power for the different computations mentioned, except for direct multiplication and obtaining the hyperbolic functions where the circuits must be fed with a-c power. In all cases the operation of the circuits is simple, quick, and systematic, and ordinary measuring instruments (ammeters and voltmeters) are used.