COOLING, STORING, AND SHIPPING MILK. 27 
F.; the milk in the 1-inch felt jacketed can traveled 33 times as far; 
and that in the insulated can 65 times as far. 
Tn the second experiment the same cans were used and the other 
conditions were the same, except that there was no country haul and 
the milk was cooled to 40° F. before being started on its journey. 
The results are shown graphically in figure 20. The milk in the 
ordinary can reached a temperature of 50° F. after traveling about 
75 miles; that held in the 4-inch jacketed can after 355 miles; that 
/60;- 
8 
P| 
E, DEGREES F 
es 8 
TEMPERATUR 
TIME~ HOURS 
Fic. 21.—Relative efficiency of four types of cans in shipment of milk from Chicago to 
Washington,.D. C. 
in the can covered with the 1-inch felt jacket after 385 miles; and 
that in the insulated can after 605 miles. 
In the third experiment 4 similar cans of milk were shipped 
from Chicago, Ill., to Washington, D. C., a distance of 787 miles, 
in an ordinary baggage car. As in the previous experiments the 
doors were opened at stations to receive and deliver baggage. The 
data obtained in this experiment are shown graphically in figure 21. 
1This shipment of milk was supervised by R. S. Smith, of the Dairy Division. 
