1915- No. 2. 



SPITSBERGEN WATERS. 



53 



city (distance of mark from the centre of co-ordinates) of the relative move- 

 ments. N means noon, and M midnigth; the direction given mean those 

 from which the water at the depth in question moved in relation to the 

 ship (or ice-floe), or rather the direction towards which the ice-floe moved 

 in relation to the water at the depth in question. The black discs along 

 J> N 



50 nv 



WO 7rv. 



Figs. 40 — 43. Central Vector Diagrams of the Relative Movements at 50, 100, and 200 Metres, 

 and at the depths of between 300 and 470 Metres, at State 41. The last mentioned dia- 

 gram, Fig. 43 probabl3' gives approximately the velocities of the vessel and the surface layers, 

 and the direction towards which the\- drifted. 



the curves indicate the actual observations, a ring instead of a black disc 

 indicates that the observation was doubtful. 



These central vector-diagrams cannot be considered as more than very 

 rough estimates, as they are based upon far too few observations. At 20 me- 

 tres there are only 14 observations in 36 hours, at 50 metres 13 observations 

 in about 40 hours, and at 100 metres 9 observations in 34^2 hours. The 

 curves of the diagrams for these depths seem, however, fairl}' probable on 



