14 BULLETIN 744, U. S. DEPARTMENT OF AGRICULTURE. 
lower than in the concrete tank, and 13 ee lower than in the 
wooden tank. 
8 
TINIE ~ HOURS. 
All tanks covered and in milk house. 
. TWME - HOURS 
SEE: 
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TIME ~HMOUYURS. 
Wa. 11.—Variation in temperature of air, water, and milk in different types of tanks. 
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“¥ SPIMDIA FAL ZINLL 
These tests illustrate the efficiency of the-different tanks for-cooling 
milk, Expressed in terms of ice melted the relative loss was 29 
