Page Line 20, " • • . where Z > 0 fluid a and Z < 0 outside fluid a -American Iron and Steel Institute and to the National Research Council for the award of an N.R.C. Scholarship. Grateful acknowledgments are due to the technical staff and graduate students of the Department of Metallurgy and Material Science at McMaster whose help has been invaluable. Many thanks are given to Mrs. Barbara O'Connor for the excellent typing of this thesis and to Mr. Martin van Costen and Mr. Don Wilson for their capable assistance with the technical drawings and photographs.
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