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เนื้อหาย่อ : PREFACE The authors of this textbook have endeavoured to present the information necessary for the develop- ment of sound drafting skills and the attainment of basic technical knowledge. Division of the material for different courses and grade levels has been left to the discretion of the individual instructor so that he may have maximum flexibility in teaching. The review questions at the end of the chapters, and the test and blueprint-reading exercises,can be used as homework assignments. The extensive section of problem assignments permits a wide selection of drawing projects to suit the various topics and the grade level and ability of the student. The authors are very grateful to Mr. Ernest Kidd, Welland High and Vocational School, for the time, thought, and suggestions he contributed during the preparation of this book.