8 BULLETIN 1398, U. S. DEPARTMENT OF AGRICULTURE 
bottom position at the bunker. Car B registered the lowest tem- 
perature throughout the trip. The temperature differences are so 
slight, however, that when the initial fruit temperatures are consid- 
ered the performance of the cars may be regarded as equal. 
Figure 7 shows the temperatures recorded for the middle layer 
at the quarter length and the average fruit temperatures of the top 
and bottom layer of the load in the second test. The middle layer 
at the quarter length is particularly hard to refrigerate, because of 
the difficulty in getting adequate air circulation at this point. At 
the beginning of the trip car A was about 3 degrees higher than 
ear B at this position. This difference gradually diminished, how- 
ever, until the early morning of the third day, when the temperature 
—~——Car A, Divided WireBasket Bunker, 
——e——Car B, Wire Basket Bunker, 
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Fig. 7.—Average fruit temperatures, second test, at top and bottom layers and 
fruit temperature at middle layers of the load at the quarter length 
of the cars was practically the same at this point. At the end of 
the trip the temperature of this position in the load had been reduced 
in car A 45 and in car B 87 degrees from the time of loading to 
8 p. m. on the sixth day, a period of approximately 514 days. The 
cars may be regarded as equal for performance at this position, 
consideration, of course, being given car A because of the warmer 
fruit with which it was loaded. Comparing the curves in Figure 6 
it will be seen that the cooling of the load proceeded rapidly in all. 
cases. At the bottom bunker position the temperatures were below 
40° IF. approximately 48 hours after loading. In the same period 
at the bottom doorway position they were below 45° F. During 
this time the flattening of the curves are apparent and still indicate 
