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A relatively simple law is proposed for the special process of dielectric relaxation which is in good agreement with the known observed behavior of solid bodies. The relevant conclusions for the behavior of a dielectric in a direct current and in an alternating current are drawn. Formulas for the computation of the residual current in a constant field and for the dependency of the capacitance and dielectric energy losses on the frequency are developed, and simple equations are given for the temperature dependence of the relaxation phenomena. A comparison with actual experience shows that the theory is a satisfactory representation of the dielectric behavior of solid bodies. The discussion also deals with a known empirical relaxation law as an approximate formula with a limited range of validity. The dielectric behavior of liquid insulators exceeds the scope of this theory but certain traits in their behavior which are similar to the dielectric behavior of solid bodies are acknowledged. 19 figures, 21 references. (ERA citation 01:025052)