Mechanical Conditions Affecting Separation 189 



Mechanical conditions ivhich 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 

 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, 

 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 



65- 



3- 



Stei 



27, 



cause of inefficient separa- 

 ation is variation in the 



velocity of the bowl. It is 



Fig. 29. 

 Parts of tubu- 

 lar bowl, quite as important that the 



Fig. 30. Section of 

 tubular separator. A, 

 skim milk vent ; B. cream 

 vent; O. milk inlet; L>. 

 wing; 3, bowl; 4, bowl 



