The use of superimposed imaginary E. M. F´s., currents and fluxes in the solution of alternating-current problems

R. E. Doherty: The scheme presented in this paper is highly useful, not only to electrical engineers, but also to mechanical engineers — indeed, useful in any problem which involves sine functions of time and in which the transient term is not of importance. And even if the transient is important, the particular solution of the permanent condition can be written down easily by this method. Making this possible, it certainly must be regarded, as the author says, a useful engineering “tool.”