340 APPLIED SCIENCE 



EXAMPLE. One pound of good coal gives out on complete com- 

 bustion, 14,500 B. T. U. of heat. Find the amount of work stored in 

 one pound of coal. 



Units of heat X Mechanical equivalent = Work in foot-pounds. 



14,500 X 772 = 11,194,000 ft.-lbs. 

 Questions 



1. Who invented the steam engine? 



2. What effect has the development of the steam engine had 

 upon trades and industry? 



3. What is a steam engine? 



4. What property has steam that allows it to drive a piston? 



5. What is the purpose of the fly-wheel? 



6. Why is a fly-wheel large and heavy? 



7. What kind of motion has the moving piston of an engine? 



8. What kind of motion has the fly-wheel of an engine? 



9. How is the motion of the piston communicated to the fly- 

 wheel? 



10. Why is it desirable to have the escaping steam enter a con- 

 denser? 



11. What is a condensing engine? 



12. What is a non-condensing engine? 



13. What is the eccentric of an engine? 



14. What is the governor of an engine? 



15. What is the efficiency of an engine? 



16. How is the power of an engine expressed? 



17. What is a rotary engine? 



18. What is a turbine? 



19. What advantage has the turbine over the reciprocating 

 (straight-line) engine? 



20. Explain how a turbine works. 



21. Explain the measuring of indicated horse-power. 



Problems 



1. What is the H. P. of an engine that is required to pump out in 

 8 minutes a basement 51 ft. X 22 ft. X 10 ft. deep, full of water? 



