/ 



% 





I 



^ 



\ 



Fig. 337. (a) a photograph at 20, 80 and 220 min after the introduction of dye. The source 

 was at the apex and there was no external sink (corresponding Fig. 336/?). (h) Photographs 

 at 5. 10 and 20 min. The dyed fluid was injected through a vertical glass tube in the south- 

 west corner of the tank and the sink was at the apex (corresponding Fig. 33('i(). (According 

 to Stommel, Arons and Faller, 1958.) 



