162 



REFRIGERATION AND ITS USES 



ing inside the house. The refrigerator is placed with its back 

 against the outside wall. An opening is made in the wall 



FIG. 122. A built-in refrigerator. 



corresponding to the rear door of the refrigerator. This 

 opening is fitted with a door also. This opening is generally 

 reached from a porch; therefore, the 

 refrigerator can be as easily filled from 

 the outside as it could be from the inside 

 of the house, thereby saving much dirt 

 and inconvenience. 



In many modern houses the refriger- 

 ator is " built-in," that is, it is con- 

 structed as a part of the house just as 

 truly as is the stair case (Fig. 122). 



191. The Refrigerating Machine for 

 Home Use. During recent years many 

 devices have been constructed to take 



FIG. 123.-A mechanical the P lace of the refrigerator in the 

 refrigerator. home. They all involve the principles 



employed in the manufacture of ice and 



in cold storage plants (see next two sections). Figure 123 

 shows one such device. It is really a small cold storage plant 



