THE PASTEURIZATION OF MILK 



for it to remain at the bottom, and so be heated 

 before it is discharged. In this holder, also, the 

 outflow is from the top, but the flowage into the 

 discharge pipe is from many points at the surface 

 into a gathering pan. In this way surface cur- 

 rents are avoided. 



One of the disadvantages of the upright tank 

 holder is that when it is of large size it is rather 

 difficult to clean. It becomes necessary for the 

 workmen to get inside the tank in order to thor- 

 oughly clean it. Some upright tanks are being 

 made which are mounted upon trunions in such a 

 way that when the pipes are disconnected the tank 

 may be turned into a horizontal position, and the 

 cleaning can then be more easily performed. 



A second form of continuous or flow type tank 

 is so constructed that a long horizontal tank, which 

 opens at the top, is divided by cross partitions into 

 several compartments. At the top of each of these 

 partitions is a gathering trough, extending along 

 the upper edge of the partition. A tube attached 

 to the centre of this trough extends to near the 

 bottom of the next succeeding compartment. This 

 is shown in Fig. 26. 



In operation, the milk enters into the compart- 

 124 



