Discussion on “electric drive for reversing rolling mills” (Wilfred Sykes and David Hall), Cleveland, Ohio, June 27, 1916. (see proceedings for June, 1916)

K. A. Pauly: There are several points in connection with this paper by Messrs. Sykes and Hall to which I wish to refer in discussion. One of the first points which is worthy of attention is that of the rating given these motors: namely, a horse power corresponding to the maximum torque which they will carry without any mention of the time during which they will carry the load. All will agree that a rating on this basis is not only contrary to the recommendations of the A. I. E. E., but is very unsafe for the purchaser on which to base the relative capacities of competitive equipments for any class of service. That the idea of so rating these motors is a new one will become apparent to any one examining the publications of the company with which the authors are connected. The early publications showed, for example, 3000 h.p. as the capacity for the motors of the Steel Company of Canada now rated at 10,000 h.p. On this same basis, any one of the 6000 h.p. motors at the Gary Works of the Illinois Steel Company might be rated at 20,000 h.p.