Time response constant and transfer function of magnetic amplifiers

Several years ago Dr. T. A. Buchhold of the General Electric Company, while still associated with Redstone Arsenal and later with Ford Instrument Company, made theoretical investigations about the transient performance of magnetic amplifiers. In the course of his work the concept of the specific dynamic resistance of square loop core materials and, directly related to it, the concept of the dynamic resistance of magnetic amplifiers was established as a convenient means to express mathematically the performance of such amplifiers. Although Dr. Buchhold presented his findings in an internal company report, his work has unfortunately never been published as a paper. This situation causes certain difficulties in presenting a paper which uses the foregoing concept without at the same time referring in at least some detail to Dr. Buchhold's original work.