310 MARKET DAIRYING 
in a steam chamber of sufficient strength to withstand a 
pressure of about fifty pounds to the square inch. These 
sterilizers are usually constructed of concrete or brick and 
Woe: 
menang Whee 
BELLIES 
Ww OA 
[fz 
HASP 
ASBESTOS 
ae 
5 IRON ROD 
5" CONCRETE WALL 
CAST IRON WASHER 
Fig. 61.—Cross-Section of Concrete 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 
