Jahresbericht  Hr.11/1956

-  Seite  78  -

the  Schmal-Tief.  The  three  latter  surveying  tasks  could  not  quite  be  concluded.
The  Becca  method,  operated  partly  with  two  navigator  equipments,  was  successfully ­
  applied  for  the  survey  of  the  outer  sea  area  off  the  isle  of  Juist
up  to  Wangerooge,  of  the  Steingrund  and  the  outer  part  of  the  Aufleneider.
Within  the  compass  of  the  above  mentioned  survey  work  the  mean  high  water
line  was  fixed  by  levelling  on  "Alte  Mellum";  on  the  Düne  of  Helgoland;  on
Kniepsand;  and  in  the  eastern  part  of  Baltrum  as  well  as  in  the  western  part  of
langeoog.
To  procure  basic  material  for  a  new  edition  of  a  fishery  chart,  survey  and
research-vessel  "Gauss"  undertook  a  survey-cruise  in  the  waters  between  Iceland
and  Greenland.  Surveying  work  centered  in  the  area  from  the  Gammelloch  across
the  Anton-Bohrn-Bahk  to  the  fishing  ground  of  Angmagssalik.
In  addition  to  her  surveying  activity,  survey  and  research-vessel  "Gauss"
carried  out  eight  research  cruises  and  trial  trips.
The  two  wreck-searching  boats  ascertained  on  the  official  routes  in  the  offshore ­
  waters,  in  the  river  estuaries  and  in  the  surveying  areas  a  total  of  11
new  wreck  positions  and  checked  44  wrecks  determined  already  before  as  to  their
present  position,  state  and  depth.
The  survey-ship  "Eungholt",  which  was  put  out  of  service  at  the  end  of  the
surveying  period,  was  replaced  end  of  December  by  the  new  survey-ship  "Siideroog".
Oceanographical  work  at  sea  had  to  be  confined,  due  to  the  abundance  of
material  still  waiting  to  be  worked  up  and  the  considerable  amount  of  routine
work,  to  some  current  measurements  in  the  Horth  Sea  which  were  carried  out  in
cooperation  with  the  Federal  authorities  and  those  of  Schleswig-Holstein  concerned ­
  with  coastal  engineering.  The  oceanographic  observation  material  collected  by
fishery  research-vessel  "Anton  Dohrn"  could  to  a  large  extent  be  evaluated  and
utilized.  Some  members  of  the  staff  of  the  DHI  took  part  in  her  cruises  in  the
northern  waters.
The  studies  of  numerical  calculation  methods  for  the  ascertainment  of  the
wind-conditioned  water  movement  by  means  of  an  electronic  computing  machine  and
the  kind  assistance  of  Professor  Eossby  from  the  Swedish  Meteorological  Institute ­
  at  Stockholm  were,  for  the  time  being,  brought  to  an  end.
In  cooperation  with  the  Deutsche;  Wissenschaftliche  Kommission  für  Meeresforschung, ­
  the  International  Council  for  the  Exploration  of  the  Sea  and  the
Comité  Spècial  de  l'Année  Géophysique  Internationale  plans  for  a  quasi-synoptic
oceanographic  survey  of  the  Horth  Atlantic  Ocean  were  set  up.
Routine  cooperation  in  the  Sailing  Direction  Work  as  well  as  the  taking
care  of  the  Ice  Service  and  of  the  geomagnetic  work  were  done  as  usual.  An  Atlas
relating  to  the  ice  conditions  in  the  German  Bight  and  in  the  western  Baltic  is
in  the  press.
The  Hautical  Tear-Book  and  the  Tide  Tables,  Toltane  I  of  which  was  extended
+)  Die  Umschau  1957,  Heft  3.