534 



Proceedings of the Royal Physical Society. 



A very small flame may be obtained, and there is little or no 

 risk of the flame running down the tube to the lower orifice. 

 Each microscope table has similar fittings. The pieces of new 

 apparatus in this room are, first, a steam steriliser (Fig. 14), 

 modified from one suggested by Dr Aitken on the principle 

 of Bunsen's continuous supply for the hot water evaporating 

 bath. It consists of tw^o parts, the steam chamber and the 



Fig. 14. 



(a) Water in steam chamber ; {h) supply tube ; (c) lower chamber of 

 reservoir ; {d) communicating pipe ; {e) reservoir ; (/ ) severed cap ; {g) "air 

 tube ; (7i) water gauge ; {i) thermometer ; {k) felt covered lid. 



reservoir. The steam chamber is simply the ordinary 

 Koch's chamber covered with felt, but with a conical copper 

 bottom {a). The reservoir consists of a cylinder (e) the same 

 size as the steam chamber, and placed at the same level. It 

 is practically a double chamber, and, just at the level of the 

 base of the inverted copper cone bottom of the steam chamber, 

 is a second bottom, into which is soldered a piece of tubing {d) 



