Milk and Crca 



•cam 



27 



View of the pre-hcatcr and clarifirr at the Tiinii-r f'entre 

 System, SomerviUe, Mass. The l-'oxlioru Ldiij; Distanee 

 Dial Type Indicating ThermometiT inserted is edinmonly 

 used on pre-heaters. 



(often 40 ' F. in winter time) a ])fe-lioater is usually 

 necessary. The heating- may be accDiiiplished by 

 running the cold milk countei'-current to hot water, 

 or by other methods. A temperature of 85° to 

 100° r. has proved satisfactory for the subsequent 

 process of clarifying. It is almost necessary to in- 

 stall a recording thermometer on the pre-heater in 

 order to save heat and to prevent the milk from 

 scorching. 



The centrifugal clarifier strains the milk at any 

 temperature, but works more efficiently when the 

 milk is heated 85° to 100° F. The clarifier removes 

 the dirt, pus cells, blood corpuscles, etc., without 

 separating the whole milk and aerates tlie milk, 

 which improves its flavor. The machine may be belt 

 or turbine driven, and if the latter a pressure reg- 

 ulator i)! the steam line will insure a uniform pres- 

 sure. Tlie clarifier will not operate efficiently unless 

 it is run at the prescribed speed, 



