The Control of the Speed and Power Factor of Induction Motors

IN recent years the use of the three-phase system of distributing electric power has been rapidly extending. The great advances made in the methods of controlling economically the speed of induction motors are not known to many engineers. It is necessary, in order that they may choose the best kinds of motor for their everyday work both from the points of view of ease of control and of economy, that they should be able to study for themselves their relative advantages and disadvantages. We therefore welcome this book by one of the leading authorities on the subject.The Control of the Speed and Power Factor of Induction Motors.By Dr. Miles Walker. Pp. 151. (London: Ernest Benn, Ltd., 1924.) 18s. 6d. net.