Mechanical Conditions Affecting Separation 187 
the passage of the milk from its 
entrance at the center to the outside, 
causing it to travel a much greater 
distance and be subjected to the 
centrifugal force for a longer time. 
These contrivances, while adding to 
the complexity of the machine, have 
increased the capacity and the effi- 
ciency of the separation. The best 
known of these contrivances are the 
so-called “Alpha” dises or 
Fig. 26. Parts of United States 
separator bowl. 
plates,—a series of cup- 
shaped plates, nearly fill- 
ing the bowl of the 
separator. These Alpha 
plates nearly double the 
- separating capacity of 
Fig. 27. United States separator. the hollow bowl of the 
