FRIDTJOF NANSEN. 



M.-N. Kl. 



there is a maximum at 8 a. m. 

 (Aug. 1 8th) and a secondary 

 maximum between i and 2 

 p. m. In the second great 

 wave there is a secondary 

 maximum at 6 p. m. and a 

 greater maximum at about 

 10 p. m. In the third big 

 wave there is also a tendency 

 towards a simular develop- 

 ment of a secondary maxi- 

 mum at about 6 or 7 a m. 

 (Aug. iQth), besides the chief 

 maximum at 10 a. m. 



This might be due to Fig. 38. Central Vector Diagram of the Relative Move- 



the effect of the local tidal ment at 10Metres , at Stat. 4 i, from Aug. i8th 2 a. m. 



to Aug. igth 2 p. m. N means Noon, M Midnight. 



wave of the North Polar 



Basin in addition to the great tidal wave of the Atlantic; but without more 

 complete material in the form of observations, nothing can be said with 



certainty in this respect. 

 One remarkable and con- 

 spicuous effect of the 

 2 o/.?n, great tidal period is that 

 at intervals of about 

 twelve hours, the move- 

 ment at all depths, be- 

 twen the surface and the 

 deepest layers, have a 

 marked tendency to ap- 

 proach zero. 



By taking the direc- 

 tions and velocities for 

 each hour from our cur- 

 ves Figs. 36 & 37, the 

 vector-diagrams, Figs. 38 

 43, have been con- 

 structed. The marks, with 

 the numbers of the hours, 



so cm/ sec. 



Fig. 39. Central Vector Diagram of the Relative Movement along the curves indicate 



at 20 Metres, at Stat. 41, from Aug. i8th 1.50 a. m. to 

 Aug. I9th 1.28 p. m. 



the direction and velo- 



