HEATING THE HOME 



Directions. I. Fill the flask with water and insert the 

 stopper so that water stands in the tube about an inch from the 

 stopper. Tie a colored string around the tube at the surface 

 of the water. Heat the flask and watch the liquid in the tube. 

 Remove the lamp and allow the water to cool. What happens 

 to the water in the tube in each case ? What does this show ? 



2. Secure two flasks, one a little smaller than the other. 

 Break a hole in the bottom of the smaller one. Fill the larger 

 flask with water and insert a rubber stopper with two holes. 

 Through these holes push two pieces of glass tubing about ten 

 inches long. Push in one tube until it just passes through the 

 stopper. Push in the other tube about halfway to the bottom 

 of the flask. Invert the other flask, insert a rubber stopper 

 with two holes and push in the ends of the glass tubings. Add 

 water until the upper ends of the tubing are covered. Add a 

 few drops of red ink. Heat 



the lower flask and notice 

 the circulation of the water. 



3. How are the principles 

 illustrated in these two ex- 

 periments applied in the 

 hot-water heating ? 



Steam heating. The 

 method of heating by 

 steam is similar to the hot- 

 water method except that 

 steam instead of hot water 

 circulates. There is a 

 similar system of radiators 

 connected by pipes with 

 the furnace. At the fur- 

 nace the boilers are so ar- 

 ranged that the water is 

 changed into steam, which 



FIG. 3. A steam-heating system. 



then circulates through the pipes. The same indirect 

 method, as explained under the hot-water system, and like- 



