86 



MARKET DAIRYING 



in a steam chamber of sufficient strength to withstand a 

 pressure of ten or more pounds to the square inch. These 

 steriHzers are usually constructed of concrete or brick and 



tig. 39.— Cross-Sectiou of Coucrete Sterilizer. 



are provided with a heavy iron door which is large enough 



to admit a truck bearing the pails, cans, bottles, etc. Other 



sterilizers of this type are constructed of galvanized iron. 



The principal drawback to some of these sterilizers is 



