the University of Paris, France, and Dr. Arnold Hargreaves of the Manchester College of Science and Technology, England, was made possible through financial aid provided by the United States Office of Naval Re­ search. This assistance is greatly appreciated. Major contributions to the conference were made by the following individuals who chaired the technical sessions: Dr. William D. Forgeng, Electro Metallurgical Company, Niagara Falls, New York Dr. Kurt F. J. Heinrich, E. I. du Pont de Nemours and Company, Wilmington, Delaware Mr. Robert A. McCune, University of Denver, Denver, Colorado Dr. Dan McLachlan, Jr. , Stanford Research Institute, Menlo Park, California Dr. William H. Robinson, Carnegie Institute of Technology, Pittsburgh, Pennsylvania Dr.