Mechanical Conditions Affecting Separation. 115 
separator. These Alpha plates nearly double the 
separating capacity of the hollow bowl of the same 
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Hil 
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Fig. 13. Parts of bowl of ‘' United States’ type. 
diameter, and at the same time the efficiency of sep- 
aration is increased. 
Mechanical conditions which 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, athe bowl may trem- 
