CONTENTS 1
1．Advantages and Disadvantages of Two-stroke Cycle over Four-stroke Cycle Engines 1
2．Small 4-wheel Riding Tractor 7
3．Disc Ploughs 11
4．Grain Drills 15
5．White to Release Big Rotary Combine 19
6．Automatic Calf Feeders 25
7．The PTO Dynamometer and the Drawbar Dyna-mometer 29
8．Three Kinds of Efficiency 35
9．Matching Tractors and Implements 41
10．Scope of Mechanization and Appropriate Tech-nology 47