4 6 



METHODS OF STERILISATION 



screw; and into the bottom is fitted a brass cylinder 

 carrying the filter candle and prolonged downwards 

 into a delivery tube. Leakage is prevented by means 

 of rubber washers. 



Into the top shoulder a tube is inserted, bent at 

 right angles and provided with a tap. All the brass- 

 work is tinned inside (Fig. 38, a). In use the reservoir 

 is generally mounted on a tripod stand. 



To Sterilise. 



i. Insert the filter candle into its cylinder and screw 

 this loosely on. 



FIG. 38. Fakes' filtering reservoir pressure and aspiration. 



2. Wrap a layer of cotton- wool around the delivery 

 tube and fasten in position. 



3. Remove the nut carrying the pressure gauge and 

 plug the neck with cotton-wool. 



