Abstract :
V. Karapetoff: Mr. Kostko deserves much credit for having consistently followed what may be called a graphico-analytical method of solution of the single-phase induction motor, without the use of complex quantities. He is somewhat in the position of an arctic explorer who went to verify indefinite rumors about a favorable passage, and proved concisely that there was none. Someone had to do it, but few will appreciate the real value of a contribution consisting of a negative result. To me Mr. Kostko has proved only that by the method which he adopted no particularly useful results can be obtained either for a designer, an operating man, an experimenter, or a theoretical investigator. In order to use his results intelligently, one has to study carefully about twelve columns of weary mathematics and several complicated geometric figures. And when one finally arrives at the end, one finds the familiar old fact that the no-load and short-circuit tests alone do not determine the circular locus. It is necessary to use approximate relationships and empirical coefficients as given in his paper.1 The limits of validity of these assumptions, or the magnitude of error committed, would be difficult to estimate, especially with a new motor of unusual constants.
