I started this book as a student at Withlacoochee Technical Institute, under the instruction of a student of the electron flow since his teen years. Since then, the education I have received has been profitable both financially and intellectually. The graduating students are sought after, the class has become well known and it can only result from the benefit of excellent text and a formidable instructor, who teaches from this book. Buy it, read it, study it and learn from a profitable investment.