22 
For current measurements carried out during the 
R.V. "Meteor" cruises nos. 3 and 15, Richardson cur- 
rent meters (GV) of Messrs. Geodyne/USA were used in 
the near-bottom and at the 1,000 m level, and depth 
current meters (HVT) of Messrs. Hydrowerkstätten in 
Kiel (see also Table 5) were used in the 600 to 
800 m levels. During R.V. "Meteor" cruise no, 53, 
Aanderaa equipment of Messrs. Aanderaa/Norway (see 
Table 10) were used in addition to the Richardson 
current meters. 
The moorings during cruises 3 and 15 were laid 
out by surface buoys, the mooring during cruise 553 
was made without surface buoys in order to exclude 
the influence of movements at the sea surface. The 
buoyancy elements were so arranged that all the 
parts of the moorings lay as vertical as possible, 
and that sufficient residual buoyancy was present 
in each section; so that —- in the case of an even- 
tual severing of the mooring lines - at least indi- 
vidual components could be salvaged. The take up of 
the moorings took place during cruises 15 and 53 with 
the aid of recovery equipment which were mounted in 
pairs above the anchor weights and released after a 
certain period or by receipt of an acoustic signal 
sent out from the ship. 
The processing of the current meter data took 
place in three different ways. The films of the depth 
current meter were read off manually, the data cali- 
brated, checked, and corrected; on the other hand, 
the films of the Geodyne equipment were read off and 
processed by the manufacturer, the results were then 
transferred to magnetic tape in Deutsches Hydrogra- 
phisches Institut and corrections and improvements 
were applied. The magnetic tapes of the Aanderaa 
equipment were transferred over perforated tapes