Discussion on “power requirements of rolling mills” (Sykes), and “the economical speed control or alternating-current motors driving rolling mills” (Meyer and Sykes), New York, November 8, 1912. (see proceedings for November an

A. Dyckerhoff (communicated after adjournment): In going over the paper on The Economical Speed Control of Alternating-Current Motors Driving Rolling Mills, it occurs to me that some statements made in this paper are misleading, and also that many points are not brought out which should be mentioned. While I do not wish to invade the territory of the rolling mill engineer, whose task it is to find out the best rolling methods, and to whose needs the electrical manufacturer has to adapt his machinery in ways consistent with the best engineering practise, I wish to make a few remarks as an electrical engineer connected with steel and rolling mills. I feel myself the more qualified to speak since I had a very good opportunity during the past summer to study in Germany the question of economical speed regulation of a-c. motors, and its reliability in practical application under severe conditions.