Part 46

4. Give an example showing the durability of the Hennibique construction. Page 326.

5. What advantages over the wooden bearing pile has the concrete bearing pile? Page 327.

6. How may the resistivity of usual concretes be reinforced? Page 329.

7. Explain the use of wales in reinforcing a water front. Page 331.

8. How are the bearing piles of a wharf in the tropics made? Page 332.

9. Enumerate various uses to which concrete has been put in construction. Pages 333, 334.

10. What is the problem of the concrete telegraph pole? How may this be overcome? Page 336.

11. How is the Corell tie made? The Percival tie? Page 337. 419

12. What part does steel play in the construction of the Gatun Locks of the Panama Canal? Page 337.

13. Give an illustration of the use of steel for molding concrete. Page 339.

Chemistry and the Industries.

1. Why has it been necessary to put industry on a scientific basis? Page 342.

2. Why is chemistry so closely related to the industries? Page 343.

3. Tell in your own words the story of the development of the soda industry. Page 344.

4. Name three important industries which grew out of the soda industry. Page 346.

5. Give an example of how science has led the way for industry. Page 348.

6. What are the great achievements before the chemistry of the future? Page 350.

The Producer-Gas Power Plant.

1. What was the drawback to the early development of the gas engine? Page 353.

2. Why was the suction producer not practical? Page 354.

3. What led to the introduction of the pressure producer? Page 355.

4. What is the advantage of the down-draft producer? Page 355.

5. What is the ideal relative efficiency of the producer-gas plant and the steam plant? The actual relative efficiency? Page 360.

6. What defects in producer-gas plants were learned from the inspection in 1908? Page 364.

7. Where are the producer-gas plants of England located? Page 366.

8. How can the price of power developed from fuel be 420 kept down? Page 369.

Efficiency in Shop Operations.

1. What is the reason for the failure of many cost systems? Page 371.