52 A DAIRY LABORATORY GUIDE 



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EXERCISE VIII 

 BABCOCK TEST AND LACTOMETER 



1. (a] Test by the Babcock method a sample of 



whole milk, skimmed milk and butter. 



(&) Retest the butter in the hand machine. 



(c) Retest the whole milk in the steam ma- 

 chine, but do not let the speed of the 

 machine exceed 250 revolutions per 

 minute. 



In performing the above experiment it is 

 best to experiment with the machine 

 before putting in your samples. Other- 

 wise, you will be liable to run the ma- 

 chine too fast. 



2. (a) Take a lactometer reading of the whole 



milk and figure out the S. N. F. and 

 T. S. 



(&) Take a lactometer reading of the skimmed 

 milk and figure out the S. N. F. and T. S. 



3. (a) Test the skimmed milk for acid with n/io 



alkali solution and the alkali tablet solu- 

 tion. The alkali tablet solution was 

 made by dissolving eight tablets in 95 cc. 

 of water. 



(b) Test for acid 18 grams of tap water. Add 

 to 18 grams of tap water 3 cc. of starter 

 or buttermilk, again test for acid. Use 

 n/io alkali solution. 



