A DAIRY LABORATORY GUIDE 55 



EXERCISE X 



BABCOCK TEST. LACTOMETER READING 

 AND ACID TEST 



1. Make a Babcock test of cheese, whole milk and 



skimmed milk. Add acid to the skimmed 

 milk about one-quarter of an inch above the 

 usual mark, and run ten minutes, two min- 

 utes and one minute. 

 Run the whole milk the usual time at the usual 

 speed. Be sure to cut the cheese fine before 

 putting into the test bottle. 



2. (a) Retest the whole milk, running the machine 



one minute, one minute, one minute. Be 

 careful to run the machine at the same 

 speed at which it was run the first time. 

 Do you get any different results either in 

 the amount or the appearance of fat? If 

 so, give the reasons. 

 (b) Retest the whole milk, running the machine 

 fifteen minutes, five minutes and three 

 minutes. Do you get any more fat than 

 when the machine is run the usual length 

 of time? Be careful to run the machine 

 at the same speed at which it was run 

 the first time. 

 Oil the machine well before each run. 



3. Take the B. of H. lactometer reading of skimmed 



milk and whole milk. Make corrections for 

 temperature and figure out the S. X. F. and 

 T. S. for whole milk, using three formulae. 



