10 



BULLETIN 240, TJ. S. DEPARTMENT OF AGRICULTURE. 



it. The temperature of the water in the pasteurizing section is auto- 

 matically maintained. 



In figure 6 is shown another type of in-the-bottle pasteurizer which 

 is so arranged that bottles of milk may be heated with ordinary 



F IG> 5. Metal caps in frame for protection of bottles as operated in machines shown in 



figures 4 and 6. 



caps. The pasteurizer is made of sheet metal and contains racks 

 which hold crates of bottles. The tops of the bottles are covered 

 with metal caps of the type shown in figure 5. The crates of raw 

 milk covered with metal caps are placed on the racks in the pasteur- 



FlG , g.— A pasteurizing machine in which paper-capped hollies are protected by metal 

 caps, and heating and cooling are done, respectively, by circulation of hot and cold 

 water. 



izer and heated by means of hot water which is forced against the 

 bottles. The water is circulated by means of a pump and is used 

 continuously. After the milk has reached i L5 C F. it is held for 30 

 minutes and then cooled. Cooling is accomplished by replacing the 



