286 



GENERAL SCIENCE 



soil pipe through the opening in the roof. If all the joints leading 

 to the drain pipes are not perfect, the odor of peppermint will be 

 detected in the house. The soil pipe should be covered for test. 



Fixtures in the House. Fixtures for the water supply in the 

 house should be made of enameled iron or porcelain. They must 



FIG. 185. A water 

 trap. Why does 

 the water pre- 

 vent sewer gas 

 entering the 

 house? 



FIG. 186. A water 

 trap for a refrig- 

 erator. 



FIG. 187. Why is it nec- 

 essary to have a vent 

 stack through the roof? 

 Why is each fixture 

 furnished with water 

 trap? 



be easy to clean, and all parts easily accessible. Hydrochloric acid 

 may be used as a disinfectant and remover of stains from hard 

 water. 



Facts to be Remembered. 



1. Pure water is a luxury. 



2. Pure water is a necessity. 



3. Pure water is cheap. 



