Grade 



Date 



(44) 



EXERCISE 24. 



Object. — To learn the correct use of milk coolers. 



Apparatus. — Quantity of water or milk; milk cooler; supply of milk cans; 

 thermometers. 



Step 1. Weigh out 100 pounds of the milk or water and have the tempera- 

 ture about that of milk when taken from the barn, 90°. Place in the 

 cooler vat. 



Step 2. Arrange the cold water inflow to give full flow, take the temperature 

 of inflow, of outflow, and length of time to cool the milk to 50° and the 

 amount of water needed. Record data below. 



Step 3. Same as step 1 and 2 except have water passing through the cooler 

 with only half pressure. Record data. 



Step 4. Same as step 1 and 2, only determine the length of time and amount 

 of water necessary to cool to within 3 degrees of the temperature of the 

 water. Take temperature of inflow and outflow in all cases. 



