Mechanical Conditions Affecting Separation 189 
Mechanical conditions which affect separ- 
ation.—Certain peculiarities in the con- 
struction or operation of the machine 
often materially influence the efficiency of 
separation. One of the most important of 5 
these is that the bowl should run steadily 
and smoothly, without any preceptible jar 
or trembling. The trembling 
| of the bowl may be caused by 
lack of perfect balancing in the 
bowl itself. This can be rem- 
& edied only by the manufacturer. 
The bowl may tremble, also, 3 
because the bearings are not 
perfectly adjusted; and, lastly, 
the bowl may tremble because 
the machine is not set level or 
upon a solid foundation. Often 
a bowl will tremble somewhat 
while it is speeding up but 
will run smoothly when full 
speed is attained; such a bowl, 
however, will seldom work as 
perfectly as one that is so 
balanced that it will run at 
any and all speeds without 
perceptible jar. A second Z 
cause of inefficient separa- ,,,"ie. Section gf 
tubular, peeearator. 
7 a cs 5 = cream 
ation is variation in the ‘ent; 0, milk inlet; D 
‘ : " wanes 3, bowl; 4, bowl 
Fig.29. velocity of the bowl. It is  bottom:’s dividing wall; 
Parts of tubu- Ps a drag shell; Peaeeare 
lar bowl. quite as important that the Srews “Pet cream 
