COOLING, STORING, AND SHIPPING MILK. 



23 



the milk in the can was about the same as in the ordinary milk can, 

 No. 6. 



Comparing the time required for milk to rise in temperature from 

 44° to 50° F. with the ordinary can (No. 6), it will be found to be 

 10.7 times as long in can No. 1, 13.3 times in can No. 2, 4 times in 

 can No. 3, 5£ times in can No. 4, and 2.7 times in can No. 5. The 

 importance of some sort of insulation for milk cans is apparent when 



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Fig. 17. — Efficiency of various types of cans for holding milk. Room temperature, 



99.5° F. 



milk is to be shipped considerable distances and reach its destination 

 at a temperature below 50° F. This last experiment illustrates very 

 well the rise in temperature which may be expected when milk is 

 allowed to stand in the sun during very hot weather. Instances in 

 which cans of milk are left for several hours without shelter or other 

 protection either on the roadside or at the milk-receiving station, 

 are too common to need comment. 



