230 AGRICULTURAL ENGINEERING 



5. What two types of feed are used in broadcast seeders? 



6. Describe the construction and the relative merits of the various 

 types of furrow-openers used on grain drills. 



7. Describe two types of force feed for drills. 



8. For what conditions is the press drill adapted? 



9. What are the important features to be considered in the selection 

 of a drill? 



10. Of what material are the seed tubes made? 



11. What is the common spacing of furrow-openers? 



12. What is a horse lift for a drill? 



