COOLING, STORING, AND SHIPPING MILK. 



13 



The range of air temperature during the test of the cork-insulated 

 tank was from 78° to 95° F. and averaged 89.3° F. Two 10-gallon 

 cans of warm milk were placed in the tank instead of one, as in 

 the foregoing tests. At the end of nine hours the temperatures of 

 the tank-water and the milk were approximately the same, namely, 

 49° F. It will be noted, however, that at no time during the test did 

 the temperature of the water rise above that of the milk, and it will 



JOOt 



O / 2 3 ^ 3" 3 ' 9 3 W 



SA.M, /O-'OOA.M. /2-OON S:OOZ?A7. "f^OORM* 



TIME- HOUf^S. 



Fig. 10. — Rise in temperature of water during 9 hours in 4 types of cooling tanks. 

 All tanks covered and in milk house. 



be further noted that all the ice was not melted until the end of the 

 sixth hour. The cork-insulated tank withstood an air temperature 

 13.3 degrees higher than the galvanized-iron tank, 9.9 degrees higher 

 than the concrete tank, and 8.2 degrees higher than the wooden tank, 

 and cooled two cans of milk instead of one to a lower temperature 

 than any of the other tanks. The final temperature of the water in 

 the insulated tank was 9 degrees lower than in the iron tank, 6 degrees 



