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เนื้อหาย่อ : Acknowledgements The author desires to acknowledge with thanks the assistance of the following national organizations that have cooperated in the production of this book: Aluminum Company of America American Welding Society General Electric Company Hobart Brothers Company Hobart Trade School Linde Air Products Company-A division of Union Carbide and Carbon Corporation Lincoln Electric Company Westinghouse Electric Corporation The author wishes to express his appreciation for the assistance of Dr. Claude Henry Ewing, Director of Instruction and Vocational Education, The Kameha- meha Schools of Honolulu, who sacrificed the time from his very busy days to edit the text and to check the illustrations and who acted in an advisory capacity from the very start of this book. Thanks are also due to Professor Joe L. Morris, Georgia Institute of Technology, and Mr. A. Leonard Logan, Educational Direc- tor, Brooklyn Y. M. C. A. Trade School, whose comments and suggestions were helpful in the preparation of this text. The author is indebted to the many teachers and supervisors who have ex- pressed an interest in this book and who have offered valuable opinions, com- ments, and suggestions.