268 



DAIRY FARMING 



their high cost, which renders their use by small dairy- 

 men almost prohibitive. 



Cheap Sterilizers. A cross section through a cheap 

 concrete sterilizer is shown in Fig. 83. It is essentially 

 a rectangular concrete tank with a wooden cover which 

 is lined with zinc. The sides and bottom are five inches 

 thick and are built of concrete, which is made up of one 

 part cement, two parts sand, and two parts coarse gravel. 

 A thin coat, consisting of one part cement and two parts 

 sand, is used as an inside finish. 



Fig. 84 shows a common galvanized iron sterilizer 

 which answers the purpose for small dairymen. 



Fig. 84. A Cheap Sterilizer. 



