364 



MISCELLANEOUS STUDIES 



The mean latitude of the drift computed from temperature data 

 (p. 362) is 35 and its direction was 45 to the right of the mean wind 

 velocity in accordance with Ekman's theory (1906) and Thorade's 

 estimate from observations (1914). From equation (78) and the 

 observed value of V (p. 363) the drift would be 3.9 miles in twenty- 

 four hours if it were due entirely to the observed winds, uninfluenced 

 by the coast and differences in specific gravity. This estimate is of the 

 same order as 2.4, that made from temperature observations (p. 363). 

 Again, direct observations of the drift having a southerly component 

 (Thorade, 1914, p. 283) near the head of the stream, Lat. 40 N to 

 50 N, gave the values presented in table 5. 



TABLE 5 

 Observed surface drift, and values computed from temperature data 



Thus the theoretical drift estimated from temperature data agrees 

 as well with the observations as could be expected. And it appears 

 from the comparisons made that estimates of the drift from tempera- 

 ture data will prove to be as reliable as those made by other methods. 



The surface current during a short time interval near the northwest 

 coast of Africa, estimated from surface temperatures, and com- 

 pared with direct observations) and with results deduced from the 

 empirically ascertained relation of winds to currents. 



From a series of direct measurements by means of a float designed 

 especially for the purpose (Schott ei al., 1914), the average flow 

 between latitudes 20 N and 28 N, off the west coast of Africa, was 

 found to be nearly parallel to the coast and toward the southwest. 

 These current measurements were accompanied by observations of 

 surface temperatures and winds, and the stations were distributed 

 along a line nearly parallel to the average surface drift and about 

 150 miles offshore. All of the observations were made during the 



