The Waidner-Wolff adjustable resistance element has t o a considerable extent been used in resistance-measuring apparatus and potentiometers.It ser ves to change the resistance of a circuit in a number of small and equal steps by means of a dial switch, at the same time r educing the effect of variations of resistance of the switch contacts and thermoelectromotive forces in the switch.The Waidner-Wolff element, modifications of it, and another arrangement serving substantially the same purpose a re considered in some detail.A three-terminal element used in bridge circuits and a four-terminal par aliel element ar e also described .The adaptability of the parallel element to form useful combinations with similar or different elements is illustrated by examples.Finaliy, therc is a list of the m ore important adjustable resistance element s now available to the designer of apparatus.
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Mueller et al. (1935) studied this question.