16 
BULLETIN 420, U. S. DEPARTMENT OF AGRICULTURE. 
While the difference in temperature between the top and bottom 
bottles was decreased to a certain extent by reversing the air, still 
there was too great a difference for satisfactory operation commer- 
cially, as there is a possibility that some of the bottles are not properly 
cooled. Furthermore, the arrangement of piping, in order -to provide 
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Fig. 10.— Cooling by forcing air alternately from bottom and top.— Difference in temperature of T>otrles at 
different positions in stack. Air reversed in direction every 15 minutes. 
for the reversal of the direction of the air through the crates, was 
more or less complicated and would involve an increased cost in the 
installation of the dampers so as to change the direction of the air 
for cooling on a commercial scale. 
