692 ALTERNATING-CURRENT WAVE-FORM [Sept 28 DISCUSSION ON " THE EFFECT OF IRON IN DISTORTING ALTERNATING-CURRENT WAVE-FORM" AT NEW YORK, SEPTEMBER 28, 1906 Charles Proteus Steinmetz: This paper deals with the wave-shape distortion produced in alternating-current circuits by the introduction of iron It is a theoretical paper, and while of scientific interest appears at first of rather little practical value to the electrical engineer There is, however, to-day only a very short step between pure scientific investigation and engineering practice; and I hope to show youi that the phenomena dealt with in this paper, and similar phenomena, are of very great practical importance in alternating-current dis- .LjL_ z_ m~~~~~F t