CHAPTER I 

 DEVELOPMENT OF THE INDUSTRY 



Dairying as an agricultural industry is very 

 old, but as a "commercial" industry placed on a 

 firm and sure scientific basis, it is very new — 

 just about a quarter of a century of age. Its 

 success is largely due to the invention of two 

 machines which have completely revolutionized 

 the whole industry. These two machines are 

 the Babcock tester and the centrifugal separator. 



The centrifugal separator. Previous to 1879 

 the only method in common use for the separa- 

 tion of fat from the milk was by setting the milk 

 either in pans or cans and allowing the cream to 

 rise naturally; but in that year two machines 

 were invented, one in Denmark and the other 

 in Sweden, which made use of the principle of 

 centrifugal force for this separation, and were so 

 constructed that the process was continuous. 

 Since that time other inventors have placed 

 modifications of these machines on the market, 

 until today there are a dozen or more styles of 



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