SUPPLEMENTARY MATERIALS 



75 



running water, how would you dispose of sewage? 



8. What is the chief danger from cesspools? 



9. If a faucet is leaking, what is the probable cause? 



10. Why are dams built thicker at the bottom than at the 

 top? 



11. What did you discover concerning the relation of 

 water pressure and the amount of water in a reservoir? 

 What does water pressure depend upon? 



SUPPLEMENTARY MATERIALS 



Reading suggestions 



Butler, Household Physics (Barrows) 

 Lynde, Physics of the Household (Macmillan) 

 Tyndall, Forms of Water (Appleton) 

 Prudden, Drinking Water and Ice Supplies ( Putnam ) 

 Clarke, Boys' Book of Chemistry (Button) 

 Garnett, A Little Book on Water Supply (Macmillan) 

 Beebe, Half Mile Down (Harcourt) 

 Bishop, The Story of the Submarine (Century) 

 Hoi way, The Story of Water Supply (Harper) 

 Thompson, Water Wonders (Grosset) 

 Bashore, The Sanitation of a Country House (Wiley) 

 Abbot, Everyday Mysteries (Macmillan) 

 Bond, On the Battlefront of Engineering (Century) 

 Bond, With the Men Who Do Things (Scientific 

 American) 



Reports which may be prepared 



1. The work of the Department of Public Health 

 of your state in protecting the water supplies 



2. The sewage disposal system of your commu- 

 nity 



3. How the water of your community is purified 



4. The disadvantages in the use of hard water 



5. The conservation of water supplies 



6. Bacteria found in water supplies 



7. Better methods of sewage disposal 



8. Water for the farm home 



9. Water systems for the farm 



10. Securing water pressure in a water system 



11. The various types of pumps 



12. Water supplies in foreign countries 



13. The Roman aqueducts 



14. The water cycle in nature 



15. Uses of the hydraulic press 



16. The building of modern dams 



17. Divers and their equipment 



Great scientists you should know about 



Archimedes 

 Blaise Pascal 



Investigations and things to do 



1. Learn to read a water meter. 



2. Examine a flush tank and locate the ball, plung- 

 er, and siphon. Determine the work of each 

 part. 



3. Make a survey study of your home and pre- 

 pare a diagram showing how water is distrib- 

 uted and controlled. 



4. Make a survey study of your community and 

 report any unsanitary conditions that you find 

 which may be endangering the health of its 

 citizens. 



5. Repack a leaky faucet with a new washer or 

 fuller ball. Be sure that the water is first turned 

 off. 



6. Secure samples of hard water and remove the 

 hardness. 



7. Visit the water supply of your city or town 

 or one nearby. 



8. Make a model of a hydraulic press. 



