REFRIGERATION OF DRESSED POULTRY IN TRANSIT. 
33 
line with scientific findings and practical experience in the preserva- 
tion of dressed poultry by refrigeration in the packing plants and 
warehouses. That definite standards have not heretofore been ap- 
plied to the performance of a refrigerator car is due to the difficulty 
of accurately determining what takes place between the closing of the 
car doors and its arrival at its destination. Without such informa- 
tion car builders were working more or less in the dark. 
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Fig. 18.— Thermograph and electric thermometer records (April shipment). 
Efficiency of cars. — If the information furnished by 120 car-lot 
shipments of dressed poultry in 120 individual cars of six different 
lines can be accepted as conclusive, we must infer that most of the 
refrigerated carriers of the United States are not able to maintain 
sufficiently low temperatures during warm weather to transport a 
low-temperature commodity, such as dressed poultry, under the best 
of conditions. It is encouraging to observe that certain refrigerator 
cars are much more efficient than others, and that their increased 
efficiency apparently depends upon their construction. 
