EXERCISE 4 (Continued) 



(21) 



Step 6. Agitate each bottle until the curd is all dissolved, by giving it a 



rotary motion as soon as acid is added. 

 Step 7. Put them into a centrifugal machine, whirl five minutes, fill to the 



neck with water about 130° F., whirl two minutes, fill to about the 9 



per cent mark, whirl one minute, and read. 



Note. — Read the whole milk test from the top of the upper meniscus to the bottom 

 of the lower meniscus. 



Report. 



1. Below give reasons for having the milk at 60° to 70°. 



2. Why is the milk poured from one vessel to another 

 before sampling? 



3. Explain the ac- 

 tion of acid in the test. 



4 Why should each 

 sample of milk be tested 

 in duplicate? 



5. What is the color |"^f8W^W : ^<jpg:||JMIiFJ 

 of the -fat column? K * Ha»M5SfiM&S 



Eight-bottle hand tester. Farm size. 



Correct method 

 of taking reading 

 on whole milk 

 bottles. From 

 the extreme lower 

 meniscus to the 

 top of the upper 

 meniscus. 



