The residual time-constant of self-saturating (auto-excited) transductors

It is well known that the time-constant of a self-saturating transductor is determined mainly by the control winding, increase in the resistance of which will have the effect of reducing the time-constant, but that the time-constant is also influenced by the main winding, so that it is not strictly proportional to the conductivity of the control circuit. The paper deals with a theory for the effect of the main winding on the time-constant, and describes laboratory tests which confirm the theory; its consequences in cases where there is negative feedback from the output voltage are particularly discussed.