:286 



Etltel McLennan 



(3) JjJtv coii(hictirit y water. 



I have to rhaiik Dr. llivett. of the Chemistry Department, Mel- 



. bourne University, for tlie use of a still, the pattern of which was 



first described by Hartley, Poole and Campbell (28), and which 



readily yields water of conductivity as low as 0.4x10—6 mhos. 



The method eniployed is briefly as follows : — 



Ordinary distilled water is boiled for about 10 mins. in a 10 

 ^litre copper vessel, open to the air, and this is connected to the 

 apparatus shown in text-figure 8. 



"^ 



Wslir 



'goiter 



r 



T 



c 



3 



I 



Text-Figure 8. 



.A diasfram of the condenser used in preparin*:^ low eondctivity 

 water, A>{ = condensing tuba; E = collecting funnel ; € and D 

 = Copper sheet baffles; Gr = tin flap welded to AB to prevent 

 condensate from soldered junction running down A.B. 



