52 



FRIDTJOF NANSEN. 



M.-N. Kl. 



50 om./s^e. 



there is a maximum at 8 a. m. 

 (Aug. i8th) 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 vv- 

 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. 19th), 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 "'^"* =' 10 Metres, at Stat. 41, from Aug. i8th 2 a. m. 



to Aug. 19th 2 p. m. N means Noon, M Midnight. 



wave of the North Polar 



Basin in addition to the great tidal wave of the Adantic; 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 

 •.cv.tro. great tidal period isthat 

 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, 

 along the curves indicate 

 the direction and velo- 



50 cnysec^ 



Fig. 39. Central Vector Diagram of the Relative Movement 

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

 Aug. 19th i.aS p. m. 



