SKIMMING EFFICIENCY OF THE SEPARATOR 



93 



bowl. The higher the speed the greater the suction and the 

 larger the milk inflow and vice versa. This principle applies 

 within reasonable limits of speed. When the speed drops below 

 the normal limit the skimming efficiency is jeopardized. 



Some of the latest models of steam turbine-driven machines 

 provide for a steam governor, similar to that used on high-class 

 steam engines, insuring an even speed for turbine-driven machines. 

 This principle has been applied in the case of the De Laval Turbine 

 separator. 



The automatic speed indicators are particularly valuable 

 in the operation of the ,hand separator on the farm. Experi- 

 ments conducted at the Purdue University Agricultural Expe- 

 riment Station 1 show that the loss of fat in the skim milk, 

 through the failure of the man behind the crank to run the 

 separator at full speed, is often very great. 



Table 6. Effect of Speed on the Skimming Efficiency of the 



Separator. 



Revolutions of Separator Crank 



1 Hunziker. The Hand Separator and the Gravity Systems of Creaming. 

 Purdue Bulletin No. 116, 1906. 



Hunziker. Why Cream Tests Vary. Purdue Bulletin No. 150, 1911. 



