124 A New Dairy Industry. 



a continuous circulation of steam may be kept up in 

 the apparatus. A rubber tube is fastened to the end 

 of G and carried into a vessel with water to condense 

 the escaping steam. H is the safety valve. I, the 

 steam gauge. The bed plate is made concave, with 

 an outlet, K, to carry off the condensing water and 

 milk that may accummulate from breakage. The 



Fig. 19— MILK BOTTLES IN CARRIER READY FOR STERILIZING. 



shelves are slightly convex for the same reason. The 

 bottles are placed in wire carriers, six of which fill 

 one of the shelves of the sterilizer. They are not 

 downright necessary, but will always be found a great 

 convenience and a saving in time and labor. A carrier 

 is shown in Fig. 19. 



The duration of heating and cooling periods, which 

 together form one process of sterilization, are the fol- 

 lowing : One heating to 212° for thirty minutes, then 



