WATER SUPPLY AND SEWAGE DISPOSAL 167 



The waste water from the house is collected through 

 sinks, wash basins, bathtubs, laundry tubs, water closets, 

 refrigerator drains, and the overflow from tubs, basins, etc. 

 Each of these fixtures (fig. 85) is connected with the drain 



FIG. 85. Types of water basins and traps 



A, wash basin with safety overflow devices : excess water flows through a and out 



at d; B, trap below wash basin; C, trap below an ice refrigerator; D, overflow 



pipe constructed with entrance pipe 



pipes which carry the house wastes into the sewer. These 

 connections should always be made by means of a trap to 

 prevent gases and odors from entering the house. Various 

 kinds of traps are used, but in each some water is caused 

 to remain hi the trap in such a way as to seal the opening 

 completely, preventing passage of air currents. 



