76 A DAIRY LABORATORY GUIDE 



EXERCISE XVI 



BABCOCK TEST AND LACTOMETER 

 READING 



1. Take a lactometer reading and make a Babcock 



test of a sample of whole milk. Compute the 

 T. S. and the S. N. F. Allow the sample to 

 stand in the lactometer cylinder while you 

 do No. 2. Then remove all of the cream pos- 

 sible and add 25 cc. of water. Again make 

 a Babcock test, and take a lactometer read- 

 ing". Compute the per cent of water added, 

 the rate per cent at which water was added, 

 the per cent of fat removed by skimming, 

 the per cent of fat removed by watering and 

 the rate per cent at which the fat was re- 

 moved. 



2. Test in the steam machine a sample of whole 



milk, and a sample of butter. Retest a 

 sample from the same lot of milk in 

 the hand machine and fill the machine 

 with water at 60° F. Note the result 

 of the low temperature upon the fat column. 

 Run the same bottles which were tested in 

 the hand machine in the steam machine for 

 a period of three minutes and then read the 

 fat column. Note if there is any increase 

 in the fat column. 



