STERILISATION BY STEAM 17 



space between the two is about half filled with water, the 

 height of which is observed by a gauge-tube at the side 

 (Koch's Steam Steriliser). 



The articles to be sterilised are placed in a tin vessel 

 provided with a lid, and the bottom of which is also grated, 

 and are left in the steriliser for from half an hour to an 

 hour (from the moment when an abundance of steam is 

 given off), which suffices for complete sterilisation. 



Water-gauge 



King of flames -~r-= 



FIG. 10. KOCH'S STEAM STERILISER. 



For laboratories which are not supplied with gas, 

 Bude?iberg's steam generator offers great advantages. In 

 it the disinfecting cylinder communicates through a tube 

 4 cm. in diameter with a flat evaporating vessel, completely 

 closed all round, in which water is heated to generate the 

 steam. The disinfecting chamber is covered with a bell- 

 shaped cylinder furnished with a thermometer, and serving 

 the purpose of condensing the steam. The water so formed 

 drips back into a dish, filled with distilled water before 



