Graphical treatment of the rotating field

The object of this paper is to evolve diagrams by means of which nearly all the phenomena of the rotating field may be easily studied, and the various factors necessary for the calculation of fluxes, exciting current, etc., exactly determined. In order to avoid too frequent repetition of certain expressions, the author has adopted the expedient of using the words “addition” and “subtraction” to mean geometrical addition and subtraction of vectors according to the well-known conventional method.