1907] 
Ciirrent-Measurements . 
13 
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to  w ar  ds  the  land.  In  the  surface  stream  there  was  a strong^ 
maximum  of  velocity  early  in  the  morning-  of  the  7th  Jnly:  in  the 
bottom  stream  there  was  an  equally  marked  maximinn  some  six  or 
seven  hours  later.  These  high  maxima  only  occurred  once  a day. 
Side  by  side  with  them  there  were  at  certain  depths  several  minor 
maxima  at  an  interval  of  some  six  hours.  The  directions  were  fairly 
constant  at  50  and  65  meters  and  always  inwards  towards  the  land. 
We  found  considerable  Iluctuatious  nearer  the  snrface,  which  some- 
times  assumed  the  character  of  a tidal  current. 
From  the  progressive  vector-diagrams  (lig.  2)  one  can  see  the 
infiuence  which  the  tidal  cnrrent  exerts.  It  is  most  evident  in  the 
10  meter  curve,  where  the  chauge  of  direction  of  the  tidal  cnrrent 
is  anti-cyclonic.  At  30  meters  there  is  also  an  indication  of  a tidal 
cnrrent,  but  at  this  depth  the  trend  is  apparently  cyclonic.  There 
seem  thus  to  be  two  different  tidal  impulses,  one  of  which  can 
probably  be  ascribed  to  the  reflected  tidal  wave. 
Figure  3 shows  the  average  velocities  during  the  course  of 
25  hours,  found  by  means  of  the  progressive  vector-diagrams.  The 
diagram  shows  clearly  the  two  different  currents.  The  deep  current 
was  stronger  than  the  surface  current,  and  at  50  meters  there  was 
a maximum  velocity  (roughly  about  9 cm.  per  second).  At  20  meters 
the  average  velocity  was  about  5 cm.  per  second,  if  we  disregard; 
