18 
BULLETIN 420, U. S. DEPARTMENT OF AGRICULTURE. 
the contents of the bottles were cooled to about 50° F. (10° C.) in 
from 1 hour and 25 minutes to 1 hour and 35 minutes. 
The results obtained with inlet air at approximately 20° F. 
(— 6.7° C.) are shown by the curves in figure 13. In this experiment 
the bottles were cooled to 50° F. (10° C.) in approximately 1 hour 
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and 20 minutes. Generally speaking, with lower temperatures of the 
inlet air the rate of cooling increases rapidly. 
A study of the curves which indicate the relative drop in tempera- 
ture of bottles under different conditions and locations when air is 
blown through the stack from the bottom and from the top will show 
the advantages of the latter over the former. 
