72 GENERAL SCIENCE 



QUESTIONS 



1. What important inventions did James Watt make? 



2. How many foot pounds a minute is a horse power? 



3. Name one disastrous flood and tell something of the extent 

 of the damage. 



4. Where are the largest flour mills in the world? 



5. Explain how we may travel in a sailboat in other directions 

 than with the wind. 



6. Why do windmills not work at all times when the wind is 

 blowing? 



7. Of what use is a keel on a boat? 



8. What influence did the development of the gas engine have 

 upon the invention of the aeroplane? 



9. What is a stationary engine? 



10. Name six uses of the steam engine. 



11. What is the principal use of the gas engine? 



12. From where does the energy of the steam and gas engines 

 really come? 



13. What mechanical principles are involved in the construc- 

 tion of the ordinary farm wagon ? 



14. Name six uses of the pulley. 



15. What force is utilized by the wheel brake on a wagon? 

 On an automobile ? On a railway car ? How is this force applied 

 in each case? 



