181 



There is every reason for assuming that the eruptions 

 were of so recent a period that it is quite- likely that the cir- 

 cumstances of atmospheric circulation were at that time much 

 as they are at present. In order to get an average of the 

 wind direction and velocities, the details of the local records 

 for the years 1915, 1916, and 1917 were obtained by the 

 courtesy of Mr. E. Bromley, of the South Australian 

 Meteorological Bureau, and of the postmaster at Mount 

 Gambier. 



' ■. \ ; 



V 



\ 



\ 



/ 



W 



s*. 



\ 



\ 



$ \ 



\ 



B 



\ 



\ : 





Fig. 4. 

 Graph showing the general outline of the ash deposits 

 (A) compared with the present average annual wind 

 direction and strength (B). 



The direction, velocity, and continuity of these winds 

 were graphed in various ways (by months, seasons, years, etc.), 

 in the hope that some light might thereby be thrown on the 

 duration of the explosive activity, or on the season of the 



