134 



MILK HYGIENE 



All pasteurizing apparatus must be under the con- 

 stant inspection of a reliable man, or must be provided 

 with a self regulator. A regulator which shuts otf the 

 milk automatically if the temperature of the contents 

 of the machine falls below the given standard, was de- 

 vised by Henriques and Stribolt. Up to the present 

 time, this principle is not widely applied, but doubtless 

 it deserves to be introduced into the better plants which 

 prepare and sell pasteurized milk. Fig. 6 shows a 

 Fjord pasteurizer with a self regulator; the latter con- 

 sists of a metal thermometer (see Fig. 7) whose free 

 arm (n) is attached to a horizontal rod (r i/) which may 

 move a valve placed in the entrance pipe to the pasteur- 

 izer. 



Fig. 7. 



Automatic temperature-regulator, as devised by Henriques and Stribolt. 



The constriietion is shown by Fig. 7. As the lemperature of the 

 milk in the machine rises, the two arms of the thermometer approach 

 each other and the valve m d c is thus pressed back by the horizontal 

 rod r u, which presses ag-ainst m so that the opening- at b k is free 



