DAIRY INSPECTION 



185 



and close together. They are connected at either end 

 so that fluid can flow from one tube into another. The 

 cooling fluid enters the bottom pipe and flows upward 

 through the various pipes, while the milk flows down- 

 ward over the outer surface of the pipes from a reservoir 



Fio. 20. Tubular cooler, with continuous surface. 



at the top and is received in a collecting tank at the 

 bottom. In some coolers of this type the pipes can be 

 taken out to be cleaned and sterilized. Sometimes these 

 coolers are arranged for ice water to run through the 

 lower pipes and water through the upper pipes, the 

 object being to save ice. The corrugated coolers have 

 an ice-water section which can be attached to the bottom. 



