266 



DEPTHS OF THE OCEAN 



lo-metre arrow will represent the resultant of the two com- 

 ponents : the actual current at lo metres and the actual motion 



IOtti 



915 772y 



10171 z.^izi.'^.o^ani 



Fig. 178.— Current-Measurements at Station 49 C (ist-2nd June 1910). 



of the ship, as indicated by the deep-water measurements. 

 The actual current at 10 metres is then easily determined ; it 



