78 LABORATORY LESSONS IN GENERAL SCIENCE 



economy of a fireless cooker where gas is used for fuel. 

 Name several advantages in the use for fuel (a) of coal; 

 (6) of gas. 



5. Of the kitchen sink tell (a) the kind and size desirable, 

 and its cost; (6) the purpose of a trap for it; (c) how to 

 keep the waste pipe from becoming clogged, and how to clean 



FIG. 35. Kitchen furnishings. 



it from time to time. What is the cost of water in your town 

 for household uses? What are some advantages in the use 

 of -cistern water? Name some conveniences to be kept at 

 or near the sink. Why is it better to have open plumbing 

 (pipes exposed) than to have the pipes inside partitions or 

 cupboards ? 



