STERILISATION OF APPARATUS. II 
diaphragm is partly filled with water, which is boiled 
by means of a Bunsen flame or Fletcher burner, the 
apparatus to be sterilised being placed in the chamber 
above so as to be exposed to the steam. 
An ordinary steamer (such as is used for cooking 
potatoes or fish) will answer every purpose. In pro- 
Fic. 7.—Steam Sterilizer. 
curing such a steamer for bacteriological use it is best 
to choose one that will accommodate a litre flask 
holding a funnel, as it is often a great convenience in 
the filtration of fluids which become solid on cooling to 
carry out the process in an atmosphere of steam. 
Exact details of the way it is used will be given 
subsequently. 
