I50 



A TEXTBOOK OF OCEANOGRAPHY 



constant. Drift-bottle experiments show that in the Northern 

 Equatorial Current over 45 per cent, of the bottles drift over 

 10 miles a day ; and in the Southern Equatorial Current 54 

 per cent, show a daily velocity of over 10 miles and 23 per cent, 

 of over 20 sea-miles, with a maximum of 28*8 sea-miles. Thèse 

 drift-botdes show that off the island of Trinidad there is a 



FiG. 29. — CURRENTS OF THE AtLANTIC OcEAX. 



certain mixture of branches of the Northern and Southern 

 Equatorial Currents. Two bottles were found on the island 

 in March, 1887, which had been released at widely différent 

 points in the previous year in the Northern (12° N. Lat., 

 26° W. Long.) and Southern (s-s° S. Lat., 16° W. Long.) 

 Equatorial Currents respectively. 



