PASTEURIZING MILK. 



11 



hot water by cold, while for low temperatures a special set of cooling 

 pipes is supplied. The temperature of the heating water can be 

 automatically controlled. 



METHOD OF PASTEURIZING MILK IN BULK AND BOTTLING WHILE 



HOT. 



For the pasteurization of milk in bulk a double-walled cylindrical 

 tin tank with a capacity of about 3^ gallons was used. The con- 



Pulley 



Cover 



Steam Inlet > 



^ _ Thermometers 



« - - Air Pipe 



Revolving Paddle - 



Rubber Tube 

 with Pinch Cock 



Fig. 7. — Apparatus for pasteurizing milk and bottling while hot. 



struction of this tank is shown in figure 7. Raw milk was placed 

 in the milk tank, where it was heated by hot water in the outer 

 jacket. The surrounding water was heated by a steam jet and con- 

 stantly agitated by blowing in a small amount of air. During the 

 heating the milk was agitated by a paddle supported by the cover 

 of the milk tank. The water in the jacket was kept at a temperature 

 of about 146° F. The milk was held at a temperature of 145° F. 



