262 



DEPARTMENT OF THE NATAL StERTICE 



gations of Dr. W. Bell Dawson^ upon this current and its effect on the circulation in 

 the gulf of St. Lawrence having been of great assistance to me in the preparation of 

 this chapter. 



In order to demonstrate the effect of the wind upon the Gulf Stream, the follow- 

 ing experiment was carried out. An elongated rectangular tank with glass walls 



Calm 



Fair wind 



^^ — ^^^ — -^ — ->^ — ^-^^ — ^ 



('•i^i'-'i'^^ ''' ^^'•'iif/ ' ■■' ■■'' "■i»'. '.■.■■»,. .....1. .... .'.'>'■' L.-'i-'u i";x^. 



1 



Contrary wind 



Fig. 4.'i. — Influence of the wind upon the Gulf stream. 



(vide fig. 45) was furnished with hot and cold centres, the former at one end of the 

 tank, near the bottom, and the latter at the other, at the surface. The upper diagram 

 in fig. 45 shows the circulation this produced. On introducing a coloured solution, 



1 W. Bell Dawson. Survey of Tides and Currents in the Canadian Waters. Vide series 

 of Reports issued by the Department of Naval Service, Ottawa. 



