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In preparing the fourth edition of Farm Machinery and Equipment, the author has completely rewritten all but a small portion of the subject matter. No chapter has remained untouched. Some chapters have been dropped entirely, some consolidated, and some new ones added. The new chapters discuss hydraulic power lifts, rubber tires, lubricants and lubrication, and weed control by both mechanical and chemical means. The chapter on spraying and dusting equipment has been expanded to cover all types of machines in use, including aircraft. Other new chapters are Tillage History and Requirements, and Crop-processing Equipment. The latter includes an expanded discussion of crop-drying equipment. Since the decline in the use of animal power on most farms in the United States and Canada has caused a decrease in the use of horse-drawn equipment, the discussion of that equipment which appeared in the earlier editions has been almost completely eliminated from the fourth edition.

The design of equipment operated by tractor power is constantly changing to meet new farming practices and methods of crop culture. To keep abreast of these advances, much obsolete material on power equipment has been replaced with new subject matter. An effort has been made to cover the latest types of power equipment developed for the farm and those machines that have proved economical for the production and processing of food and fiber crops.

A selected list of references and a few questions and problems have been added at the end of each chapter. An appendix of useful data appears at the end of the text.

Although acknowledgments and credit lines will be found in the text, thanks are expressed to the farm implement manufacturers and others for their splendid cooperation in furnishing descriptive literature and material for illustrations. The author wishes also to express his thanks to the many teachers of farm machinery courses for their helpful suggestions. A sincere effort has been made to give credit wherever due, and any oversight was not intentional.

HARRIS PEARSON SMITH