STERILIZATION 



145 



milk (only a thin metal plate separating them) so that 

 both streams of milk have opposite directions ; by this 

 means, there is the advantage that the hot milk, even be- 

 fore it leaves the sterilizer, is somewhat cooled without 

 expense, while the cold milk gains quite a little heat be- 

 fore it is heated by the action of the steam. In this way, 



FIG. 12. 



Mor's regenerative milk-heater. 



steam, as well as ice, is saved. Machines built in accord- 

 ance with this principle differ much in appearance. 

 Some, for example the apparatus shown in Fig. 10, which 

 is one of the newest, consists really of two parts, the ster- 

 ilizer proper (the " high pressure pasteurizer ") and an 

 apparatus quite similar (" the regenerative heater ") 

 10 



