Siemens-Halske is sincerely thanked for their willingness to cooperate at this point. I have submitted some sections of the completed concept of this edition to specialized experts for critical review to ensure that the areas for which I am not an expert are accurately represented. Therefore, it is my pleasant duty to express my sincere gratitude to all these gentlemen for their interest and efforts, namely to Mr. Dipl.-Ing. A. Driller, Mülheim, for the electrical engineering part of the arc furnace, to Mr. Dipl.-Ing. O. Kaufmann and Senior Engineer F. Linnhof for the electrical part of the high-frequency furnace, to Mr. Director Dr. Kuhlmann, Meitingen, for the electrode section, and to Mr. Director E. Müller, Weisweiler, and Mr. Dr. G. Volkert, Sollingen, for the description.