THE BABCOCK TEST 33 



Diameter of No. of revolutions 



wheel of ivlieel 



in inches. per minute. 



10 1,074 



12 980 



14 909 



16 848 



18 800 



20 759 



22 724 



24 



693 



General Pointers. Black fat is caused by 



1. Too strong acid. 



2. Too much acid. 



3. Too high a temperature of the acid or the milk. 



4. Not mixing soon enough. 



5. Dropping the acid through the milk. 



Foam on top of fat is caused by hard water, and can 

 be prevented by adding a few drops of sulphuric acid to 

 the water. 



Unclean or cloudy fat is caused by 



1. Insufficient mixing. 



2. Too low speed of tester. 



3. Too low temperature. 



4. Too weak acid. 



Curd particles in fat are caused by 



1. Too weak acid. 



2. Not enough acid. 



3. Too low temperature. 



