A DAIRY LABORATORY GUIDE 39 



EXERCISE VI 



BABCOCK TEST AND B. OF H. 

 LACTOMETER 



1. Take the B. of H. lactometer reading of a 

 sample of whole milk. Remove the lactometer, 

 measure out two bottles for the Babcock test and 

 allow the milk to stand in your lactometer cylinder 

 while you do No. 2. Then draw off from the top 

 of the sample all the cream the pipette will hold. 

 Then add to the sample 17.6 cc. of water. Again 

 take a lactometer reading and make a Babcock test 

 and figure out the per cent of fat removed by skim- 

 ming and the per cent of fat removed by watering. 

 After drawing off cream and adding water be sure 

 to mix the sample thoroughly. Upon what rule 

 does your ability to do the above computation de- 

 pend? Better results will be obtained if the milk is 

 warmed to about 85° F. and allowed to stand as 

 long as possible. In removing the cream keep the 

 point of the pipette as near as possible to the sur- 

 face of the liquid. 



2. Test in the steam machine whole milk, skim- 

 med milk and butter. Run the skimmed milk ten 

 minutes, two minutes and one minute. Use acid 

 one-quarter inch above the mark. Retest the whole 

 milk in the hand machine and compare the results 

 with those obtained in the steam machine. 



3. (a) Take the B. of H. lactometer reading 

 of a sample of skimmed milk. See how much water 

 it will take to lower the lactometer reading one 

 degree. Great care must be taken to mix the water 

 yvith the milk as the former is poured in. This is 



