A Self-Indicating Magnetic Scaling System using Electro-Deposited Nickel-Iron Film Cores

The paper describes a method of application of electro deposited magnetic films with rectangular hysteresis loops in logical elements. One of the principal difficulties, that of getting sufficiently close coupling between the film and the associated driving and sense coils, has been overcome. The application of the films to counting or scaling circuits in particular is described. A visual indication of the count stored in such a circuit is obtained by making use of the external fields from the magnetic films. With the electrodeposition technique developed, the films can be deposited in five minutes and batches of several hundred cores have been made with saturation flux and coercive force uniform within ±10%.