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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