144 



MILK HYGIENE 



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

 Germany the}' are commonly used for simple pasteuriza- 

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



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

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



so-called ' ' 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 



