Transportation on Land 269 



9. How is the steam in a locomotive generated and put to work? 



10. What purpose is served by weighting the drive wheels of a locomotive? 



11. Suggest ways in which steam power helps us. 



12. Why are roads and railways "banked" or raised on the outer side of 

 curves ? 



13. How are steam trains controlled? 



14. In what ways does the gasoline motor differ from the steam engine? 



15. Describe the operation of the gasoline motor. 



16. Name several systems in the automobile and describe the purpose of 

 each. 



17. Name some advantages of the automobile over the trolley car. 



18. Why does an automobile stop quicker with four-wheel brakes than 

 with two-wheel brakes? 



19. How do automobiles serve steam railways? How do they lessen their 

 traffic? 



20. Suggest reasons why the auto bus is taking the place of the suburban 

 trolley lines. 



21. Why are gasoline-driven vehicles and machines replacing those drawn 

 by horses? 



22. Outline briefly the working of an electric motor. 



PROJECTS 



1. Study an automobile, with an instruction book if possible, or study a 

 dismounted car at a service shop and locate and trace the main parts 

 and systems. 



2. Study a bridge in your neighborhood. Make a sketch of it. Determine 

 the materials of which it is made. See how the ends are supported. 



3. Secure a toy train and track. Test the train under differences of 

 grade, load and curve. List your observations and explain them. 



OUTDOOR OBSERVATION 



1. Watch the construction of macadam, asphalt and concrete roads and 

 record how each is made. 



2. Observe and record different uses of gasoline motors. 



3. Observe a steam locomotive at rest and in motion. Try to identify 

 the main parts. Study the main connections. 



REFERENCES 



The Story of the Engine Decker 



The Electric Railway Buck 



The Story of the Locomotive Jackson 



The Modern Locomotive Allen 



