Anticyclones and S.A. Weather. 



63 



Appendix II. 



Provisional Chart of Isobars. 

 MAY. 



JOO/ 



02 oj ■'•<^ ^OS 06 



3010 



30 U 



300, 02 OJ 



Buchan.— His chart shows a little of the Australian anti-system in SE corner 

 isobar being convex to Transvaal, 30-11 ins. In SW corner the 

 Atlantic anti-system is also over Transvaal, 30' 12 to 30- 15 the latter 

 reaches as high as Johannesburg and the former nearly to 

 Nylstroom and as far east as Ermelo. In the N the isobars lie 

 h, and W approximately, pressure ranging from 3006 above 

 Pietersburg to 3000 in S. Rhodesia, 30' 14 at Pretoria. 



June.~The Atlantic system is over all Transvaal, its axis lying SW to NE 

 varying from 3022 over Standerton and Wakkerstroom districts 

 to 30-20 over the rest of the Colony. At Pretoria 30-21 ins. 



July.— The Anti-system has moved W as a whole, and the greatest 

 (30-24) pressure is over Potchefstroom, Wolmaranstad districts 

 not reaching to Johannesburg. The isobar 3022 reaches to 

 Potgeiter and round to Ermelo. The rest is enclosed by isobar 

 3020. The axis still lies SW and NE. 3023 at Pretoria 



