DAIRYING 



and this tends to leave more fat in the skim milk. The higher the 

 speed of the dasher the more fat is left in the skim milk, as is 

 shown by the following- figures : 



Revolutions of Dasher 

 Per Minute. 

 200 

 300 

 400 

 500 



Fat in Skim Milk, 

 Per Cent. 

 .11 

 .13 

 .20 

 .23 



PLATE 15 2oth Century Milk Heater with Pump Attachment. 



Milk heaters in which the milk passes over a metal surface 

 heated with hot water or the revolving discs filled with hot 

 water are very satisfactory for heating milk to a skimming tem- 

 perature. 



311. The influence of different temperatures of heating milk 

 on the efficiency of skimming is shown by the following figures,* 

 which are averages of the eight trials in each case : 





*Indiana Expt. Sta. Bui. 116. 



