TIDES AND CURRENTS 



by Cape Royds and Granite Harbour, to the Nordensk- 

 jold Barrier. 



The arrows indicate roughly the drift of the ice. The 

 cross ( + ) marks the spot where the Nimrod was caught 

 in the pack, and the other cross ( X ) about where she was 

 released. The hne below the arrows is the edge of the 

 fast ice. 



Current Indicator. — This was devised by Shackle- 

 ton, and set up on the ice a short distance off Cape Royds. 

 It was put in charge of Brocklehurst, who visited 

 it several times a day when practicable, from June 30 to 

 August 18, when it was finally out of action. Only the 

 earlier readings are taken into account, as it is suspected 

 that latterly the vane beneath the ice became encumbered 

 by the growth of the ice, and the readings are therefore 

 not so trustworthy. 



These readings bring out two things: firsts a current 

 nearly at right angles to that coming from Cape Bird; 

 secondly J an absence of any indication of tidal influence. 

 From June 30 to July 25, the current was steadily be- 

 tween north and west, and most frequently north- w^est. 

 The arrows show the amount of variation in the direction. 



Vol. II.-26 



