260 



CREAMERY BUTTER MAKING 



In the course of time a distinct layer of the mineral im- 

 purities of the water will be deposited upon the walls of 

 the pasteurizer in a manner similar to the formation of 

 scale in the boiler. This mineral deposit will in time 

 destroy the usefulness of the pasteurizer. 



FI_OOPl_ 



Pig. 70.— Showing method of sterilizing wash water for butter. 



A satisfactory method of purifying water by heating- 

 is illustrated in Fig. 70. The water is pumped from 

 the well into the galvanized iron tank. A, which is placed 

 about 6 feet above the floor in the boiler room. This 

 tank is tightly covered with the exception of a small 

 vent in the cover. 



The water is heated by placing a series of galvanized 

 iron pipes in the bottom of the tank through which all, 

 or a part, of the exhaust steam from the engine is con- 

 ducted. In this way the expense of heating water will 



