This book has been written as a textbook for students seeking a professional degree in agricultural engineering. The authors believe that for students with this objective the course of study should be primarily analytical, rather than descriptive, and that the analytical approach should apply not only to ideas but also to quantitative procedures and computations. We recognize that sound analysis, particularly in applied fields, is based on the understanding of theoretical principles and on knowledge of many practical considerations. We have tried to maintain a good balance between the...