Discussion on “methods of varying the speed of alternating-current motors.” (Maier) New York, December 8, 1911. (see proceedings for December, 1911)

H. W. Buck: There is a popular idea that alternating-current motors can be used only where constant speed is allowable, and that where variable speed is required it is necessary to convert the alternating current into direct current and obtain in this way the flexible speed variation through direct-current motors.