BUTTER-MAKING 231 



which the internal device consists of a series of curved blades 

 which direct the course of the milk in its passage through the 

 bowl (see Fig. 46). A third type is represented by the Sharpies 

 tubular (see Fig. 47). In this type, the bowl is of much smaller 

 diameter and much longer than in the other types. The milk 

 enters at the bottom and as it passes 'up the bowl, which is run 

 at a very high speed, the process of separation takes place. At 



Fig. 46. — Simplex separator, link-blade type. 



the present time, there are many makes of separators on the 

 market representing a great variety of modifications of the 

 three general types. 

 Conditions affecting separation. 



The completeness of separation and the relative amounts 

 of cream and skim-milk are dependent on the centrifugal force 

 or speed of the bowl, the uniformity of the speed, the tempera- 

 ture of the milk, the rate of inflow, the percentage of fat in the 



