CHAPTER XXV 



SEPARATORS 



npHE invention of the cream separator gave a 

 great impetus to the butter industry and revo- 

 lutionized the handling of milk and cream. It 

 was only after many crude and frequently unsatis- 

 factory attempts that our present efficient sepa- 

 rator was evolved. The first machine had buckets 

 or pails suspended on a wheel in such a manner 

 that, when set in motion, they flew around in a cir- 

 cle. The principle made use of at that time was 

 precisely the same as that used by our present-day 

 inventors. One of Nature's laws is, that which 

 is heaviest, when set in motion, flies farthest from 

 the centre of motion. We have, in milk, the 

 heavier skim-milk and lighter cream, therefore, 

 when milk is subjected to a strong centrifugal 

 force created by the fast rotating separator bowl, 

 the skim-milk is thrown as far from the centre as 

 it can get and forces the cream as near the centre 

 as possible. 



The machine is so constructed that the cream 

 escapes from an outlet near the centre of the bowl, 

 and the skim-milk is drawn from the inside wall 



[148] 



