STERILIZATION UNDER PRESSURE. 



61 



the water in the reservoir becoming exhausted and the 

 consequent destruction of the sterilizer. 



Fig. 9 shows a section through this apparatus. 



STERILIZATION UNDER PRESSURE. 



For sterilization by steam under pressure several spe- 

 cial forms of apparatus exist. The principles involved 

 in them all are, however, the same. They provide for 



Fig. 10. 





A B 



Autoclave, pattern of Wiesne^. A. External appearance. B. Section. 



the generation of steam in a chamber from which it 

 cannot escape when the apparatus is closed. Upon the 

 cover of this chamber is a safety-valve, which can be 



4 



