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 



N 



50 cm/sec 



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 probably gives approximately the velocities of the vessel and the surface layt rs, 

 and the direction towards which they 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, fairly probable on 



