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Some typical forms of amplidyne control are described and a method of analyzing their functional characteristics is given. It is shown how it is possible to predict the speed and accuracy of response of a follow-up control and how to avoid self-sustained oscillations. The problem is approached by the method of resolving irregular control functions into their equivalent sine-wave components. Several methods are described for suppressing oscillations due to feedback in follow-up controls and it is shown how anti-hunting systems may be worked out so as to result in a minimum impairment of the speed and accuracy of the control.