Mechanical Conditions Affecting Separation. 121 



separator. These Alpha plates nearly double the 

 separating capacity of the hollow bowl of the same 



Fig. 13. Parts of bowl of "United States " type. 



diameter, and at the same time the efficiency of sep- 

 aration is increased. 



Mechanical conditions ivMch affect separation. — Cer- 

 tain peculiarities in the construction or operation of 

 the machine often materially influence the efficiency 

 of separation. One of the most important of these 

 is that the bowl should run steadily and smoothly, 

 without any perceptible jar or trembling. The trem- 

 bling of the bowl may be caused by lack of per- 

 fect balancing in the bowl itself. This can only be 

 remedied by the manufacturer. The bowl may trem- 



