10 
BULLETLX 240, U. 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 
Fig. 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. 6. — A pasteurizing machine in which paper-capped bottles 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 145° F. it is held for 80 
minutes and then cooled. Cooling is accomplished by replacing the 
