HOW TO STUDY FARM MACHINERY 277 



but actual repairs can be made. Many machines are left in 

 the shed without checking up repairs at the end of the sea- 

 son's work. Such machines can be inspected, parts ordered 

 and repairs made. Gas engines can be overhauled, tractors 

 gone over and put in first-class shape. The instruction books 

 furnished by manufacturers are an excellent source of infor- 

 mation for this work. 



A few general exercises and projects such as suggested 

 above will follow, with additional ones briefly outlined. It is 

 suggested that a machinery laboratory manual* be available 

 for student reference for additional subject-matter, it being 

 impossible to cover the subject in this section. 



251. Tillage Machinery. 



Requirements: To make a careful study and make a com- 

 plete report on each of the chief tillage machines, includ- 

 ing a walking plow, a sulky, a gang and a tractor plow; a 

 peg-tooth, spring, and 3isc harrow; a disc and a shovel 

 riding cultivator; and a smooth and a corrugated roller. 

 Tools Needed: Monkey wrench, screw-driver, rule and pair 



of pliers. 



Preliminary Instruction: The importance of a careful study 

 of all types of farm machines is well justified by the part 

 machinery plays in farm production. The lack of knowl- 

 edge and lack of care of many machines on the farm with 

 the resulting losses should be an example for every boy in 

 his preparation for future farm work. The study of til- 

 lage machinery is just as important as the study of the 

 tractor and other power machines, altho it may not be so 

 interesting. 



*Valuable suggestions can be obtained from Farm Machinery by Wirt, 

 John Wiley & Sons, New York. 



