COLD STORAGE 67 



dead air spaces are provided: a three-quarter-inch space 

 between the concrete and the boards to which the wire 

 lathing is fastened and a four-inch space between the 

 2x4-inch studding. These two spaces together with the 

 four layers of paper used, provide a high degree of insula- 

 tion. 



The concrete floor of the refrigerator is constructed 

 upon twelve inches of cinders overlaid with asbestos, both 

 of which materials act as insulators. (See page 133.) 



The floor of the ice chamber is built of 2x4-inch stud- 

 ding running the length of the refrigerator. These studs 

 are laid about three inches apart to allow the water from 

 the melting ice to drip through. Below the ice chamber 

 is a shallow pan, which catches the drip from the ice 

 and conducts it either into the sewer or into a cooling 

 tank. The pan is supported by means of two 2x4-inch 

 studs running the full length of the ice chamber. Both 

 ends of the studs are provided with hooks, by means of 

 which the pan is readily attached to, and detached from, 

 the ice chamber. This method of attachment is necessary 

 to permit the easy removal of the pan for cleaning. 



Where a refrigerator of this style is used it is pref- 

 erably located in the corner occupied by the ice box as 

 shown in the floor plan of the dairy house (Fig. 56, page 

 131). The rear of the refrigerator is biiilt into the wall of 

 the dairy house in the same way as the side shown in 

 Fig. 23. 



The refrigerator must be provided with a door having 

 at least two dead-air spaces and two flanges which fit 

 snugly into the frame of the refrigerator. 



The ice is admitted to the ice chamber through a door 

 in the front end of the refrigerator. 



Refrigerator Cooled with Ammonia. Such a re- 



