144 



MILK HYGIENE 



pump. There is a large number of such machines. In 

 Germany they are commonly used for simple pasteuriza- 

 tion. Of the machines most used in recent years, the 



FIG. 11. 



Section, to show construction of apparatus shown in Fig. 10. a, entrance for milk; 6, 

 exit for milk ; c, steam-chamber ; d.steam-opening ; e, safety-valve. 



so-called i i regenerative heater ' ' is to be commended be- 

 cause it saves much steam. It is built according to the 

 principle that the hot milk flows past the entering cold 



