210 AGRICULTURAL ENGINEERING 



Adjusting the tractor gang consists primarily in setting 

 the plows for the proper amount of suction and proper spac- 

 ing. The gang should be attached to the tractor so as to 

 cause each plow to be drawn straight through the soil. 



Any type of plow bottom may be used in the tractor 

 gang plow from the sod to the stubble bottom. Shares are 

 now made ' 'quick detachable," enabling the shares to be 

 removed for sharpening by loosening one nut or lever. 



QUESTIONS 



1. Why is the plow considered the principal implement on the farm? 



2. What are some of the most important factors to be considered 

 in the selection of a plow? 



3. How is the size of a plow designated, and what are some of the 

 common sizes? 



4. What are the distinct plow types on the market? 



5. Of what materials are the plow moldboard and share made? 



6. Describe the adjustment of a walking plow. 



7. What is meant by the suction of a plow? The bearing at the 

 wing? 



8. What is the difference between a frame and a frameless plow? 



9. Describe what is meant by high lift. 



10. How should sulky plows be adjusted? 



11. How is the draft of a plow kept low by adjustment? 



12. What constructional features should be given consideration 

 in making a selection of a sulky plow? 



13. Under what conditions will the disk plow work better than the 

 moldboard plow? 



14. What are the common sizes of disks and disk plows, and what 

 size of furrow will they turn? 



15. Describe the construction of the deep-tilling machine. 



16. Describe the construction of hillside and reversible plows, and 

 explain their use. 



17. Describe the construction of the moldboard engine gang. 



18. How are the plows raised and lowered? 



19. What adjustments are of primary importance? 



20. Describe the construction of the disk engine gangs. 



