372 



Fig. 131. Apparatus for Fig. 132. Apparatus for 



filling divers anaerobically. filling divers under 



From Boell, Needham, and Rogers (1939) anaerobic conditions. 



A is the filling chamber. "It bears a glass universal From Holler (1943) 

 joint, B, through the upper shank of which (C) a tube 



D ending in an almost capillary point is fixed by means of the rubber con- 

 nexion, E. The pipette D is vaselined so as to be movable vertically as well as 

 from side to side. At its upper end it carries a three-way tap, F, and a teat, G. 

 The whole chamber is closed by the rubber stopper, P, through which an entry 

 tube (H) brings in the gas mixture (previously purified in the usual way by 

 passage over metallic copper in an electrically heated furnace). The entry tube 

 also has a three-way tap, /, so that part of the stream can be diverted to pass 

 through the pipette D. The exit tube is represented at K. We found it con- 

 venient to insert a wash-bottle between the electric furnace and the entry tube 

 //, so as to ensure that the entering gas mixture was not unduly dry, and also 

 a mercury trap in case of excess pressure. Inside the filling chamber there is 

 placed a diver-carrier (L) constructed of a small cardboard box and match- 

 sticks (also shown in the cross section and in perspective). This carrier bears 

 a wire arrangement to support two very small bowls, one for oil and one for 

 lithium chloride* (M and A''). These must be in such a position that they can 

 easily be reached by the movable pipette." 



* Lithium chloride solution was used as the flotation medium. 



