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The thickness of a nickel film can be determined by measuring the force required to pull a small magnet free of the surface; however, inconsistent and unreliable results were obtained with this type of measurement when the film was extremely thin and the surface slightly rough. The magnetic properties of nickel suggested that a reluctance technique of measurement could be used to determine the thickness of the nickel.
Cook, Louis H.
Savannah River Laboratory, E. I. du Pont de Nemours & Co., Aiken, S. C.