FARM MOTORS 343 



QUESTIONS 



1. To what kind of service is the windmill adapted? 



2. Is the windmill an economical motor? 



3. How long has the windmill been used? 



4. How does the windmill obtain power from the wind? 



5. Can the windmill obtain all the energy of the wind which strikes 



it: 



6. How may windmills be classified? 



7. What is the difference between a direct-stroke and a back- 

 geared mill? 



8. To what uses may a power mill be put? 



9. How is the size of a windmill designated? 



10. What are some of the important features of the construction 

 of a windmill? 



11. What special provision for lubrication may be provided? 



12. Describe how the speed of a windmill may be regulated. 



13. How does the power of a windmill vary with the diameter of 

 wheel? 



14. How does the power of a windmill vary with the wind velocity? 



15. Describe the construction of the windmill tower. 



