1907] 
CmTent-Measurements. 
23 
8 cm.  per  second.  Wlien  representing  these  average  velocities  on 
fig.  9 we  have  disregarded  changes  of  direction. 
The  curves  of  direction  will  be  found  on  fig.  10.  At  2 me- 
ters we  met  witli  continual  changes  of  direction,  although  they  are 
not  of  any  great  consequence  (up  to  30  °):  aud  it  was  not  till  we 
reached  a depth  of  100  meters  that  the  changes  became  considerable, 
and  at  170  meters  near  the  bottom  we  again  find  the  typical  curve 
for  tidal  currents.  At  this  depth  the  movements  were  no  doubt 
small,  still  they  were  quite  noticeable;  the  greatest  velocity  was 
observed  between  half  past  two  and  three  o’clock  on  the  afternoon 
of  the  27th  July,  10  hours  after  the  passage  of  the  moon,  and  proved 
to  be  nearly  5 cm.  per  second.  The  current  was  then  S.  61°  E. 
Judging  from  the  conditions  of  salinity  and  temperature  shown  in 
the  tables,  there  was  North  Sea  water  at  50  meters  with  a salinity 
of  34.7  %o,  while  at  75  meters  and  deeper  there  was  Atlantic 
water  with  very  high  salinities.  These  laye r s were  thusgoing 
