OCEAN CURRENTS 



133 



Deep-Sea Current Meters. 



The International investigations into the North and neigh- 

 bouring 1 sens have led to the introduction of several new and 

 interesting experiments in deep-sea research. Amongst the 

 apparatus tried is the deep-sea current-meter of Ekman (see 



Messenger 



Propeller 



Se/f Recording 

 Clockwork _ - 



Shot ^ 



into Cbmpass~Bcz 



FIG. 24. THE EKMAN DEEP-SEA CURRENT METER. 



Fig. 24). The apparatus is attached to a large "sail" or 

 flange, which sets itself in the direction of the current i.e., 

 in the line of least resistance. A frame working on ball- 

 bearings is attached to a line which can be lowered to any 

 required distance. Inside the frame is a four-bladed propeller 



