DAIRYING 89 



These high-pressure ovens are very expensive and they are 

 unnecessary if the bottles and utensils are well washed and rinsed 

 before the final sterilization. 



The size and the construction of the sterilizer may be adapted 

 to the needs of each place a small one may be made of wood or 

 tin and large sterilizing rooms are sometimes made of cement. 

 These have been very satisfactory in several instances. 



Plate 37. Bottle Sterilizing Oven. 



If shelves or partitions are built into an oven they should be 

 made of perforated metal so that the steam will pass through 

 them and it may be a convenience to have such made movable. 



The sterilizer should be large enough to hold all the bottles 

 an<i utensils needed for one day as it is economical to do this 

 work only once each day. 



Sterilizing ovens of various dimensions can be bought of 

 dealers and the most economical are those built of heavy gal- 

 vanized iron, angle iron, iron bolts and first class material in every 

 respect. We have used what we consider a rather expensive 



