THE PASTEURIZATION OF MILK 



creates a condition whereby a metallic taste may 

 be imparted to the milk. 



In the form shown in Fig. 15 the objections 

 due to uneven heat distribution are at least partly 

 overcome, since the heat is the same at both ends 

 and on both sides of the tank. 



In Figs. 15 and 16 there are no bearings in the 

 milk, and stuffing-boxes are therefore eliminated. 



It is obvious that when pumps of large capacity 

 force the water rapidly through the coils, the tem- 

 perature will be more nearly uniform throughout 

 the entire length, and a lower initial temperature 

 can be employed. 



In plants where a comparatively small amount 

 of milk is to be pasteurized, as frequently occurs 

 in country shipping stations, one or two tanks will 

 hold all the milk which is received at a plant each 

 day. It is therefore possible to use the tank for 

 several purposes. First, as a dumping tank for 

 receiving the milk; second, as a heater; third, as 

 a holding apparatus; fourth, as a cooler, since by 

 replacing the hot water by ice water or brine in 

 the coils, the milk can be cooled in the same tank. 

 Fifth, cans can be filled directly from these tanks. 

 In using the tank as a cooler, however, it is found 

 74 



