I- COMPRESSION 

 N STRONG COMPRESSION 

 h WEAK COMPRESSION 

 [t ICE MOVING WITH THE FLOOD 

 SPEED 



^S. RAREFRACTION 



SSS LARGE RAREFRACTION 



■~^WEAK RAREFRACTION 



(5) CLOSE ICE UNDER NEITHER 



COMPRESSION NOR RAREFRACTION 



MEAN DIRECTION OF ICE DRIFT 



SS' 



L 



39' 



40' 



4r 



42' 



43° 



44' 



45" 



Figure 123 . Diagram of tidal compressions and thinnings of ice in the neck of the 

 White Sea for three hours after high water at Sesnovets Light. 



345 



