72 



G. J. BURROWS AND C. E. FAVVSITT. 



than elsewhere. Twenty-two of the Ooonamble bores show 

 sulphates at a depth less than 1,500 feet. Excluding three 

 bores (Momba, Opera and Sandy Greek, which are excep- 

 tional in other respects), no bore water in other parts of 

 the State shows sulphate at a depth less than 2,300 feet. 

 This peculiarity of the waters from the Coooamble district 

 is not shown here to be directly accountable for any special 

 corrosion, but we believe attention has not already been 

 drawn to this singularity, and we think the matter should 

 prove of interest to geologists who know the Ooonamble 

 district. 



(6) Corrosion Experiments.— The steel used throughout 

 had the composition given in paragraph (1). Steel plates 

 were fully immersed in the water used. All experiments 

 were started simultaneously and were kept in the same 

 part of a room. No other special measures were adopted 

 to keep the temperature constant. Duplicate experiments 

 showed that the variations of temperature were sufficiently 

 uniform in the separate experiments to be negligible. After 

 the rusting had gone on for some time, the steel plates 

 were brushed, and re-weighed. This gave the loss due to 

 corrosion. The weight and surface area of all strips were 

 very nearly equal. 



Table IV. 



lhe water was not stirrei 



i here tn any way. 





Solution. 



Weight of 

 Steel strip. 



Loss of 



weight after 



37 days. 



Average loss 

 of weight. 



Distilled water 



* Woodlands Bore, water contain- 

 ing '^3% total solids, chiefly 

 sodium bicarbonate. 



64-486 

 63-235 

 65-913 

 65-735 



63-683 

 65-649 

 64-906 

 64-847 



0-288 

 0-241 

 0-296 

 0-273 



0-302 

 0-278 

 0-286 

 0-284 



0-274 



0-288 



