— 65 — COUNCIL - MARCH 1920 - APPENDIX 



Instruments. 



3. Further elaboration of instruments of precision is desirable e. g., Hydro- 

 meters, Current Meters, Tidal Gauges. It is suggested that special Investigations 

 be shared by individual countries and be reported on at the next Council Meeting. 



Sub-Surface Observations. 



4. Apart from investigations in connection with the Plaice programme. 

 Great Britain will not be in a position to undertake subsurface observations during 

 the year 1920 — 21, at any rate in the North Sea. 



It is desirable however to discuss the two following propositions for future 

 investigation: • — 



(a) To allocate the whole time services of one vessel for one complete year 

 to the study of the hydrography and plankton of a chosen section or area to measure 

 the fluctuations of the inflow of Atlantic water into the Northern North Sea. 



(b) To allocate the whole time services of one vessel for one complete year 

 to the study of the hydrography and plankton of the area off the mouth of the 

 English Channel to include the Hake Grounds and the Areas of the pelagic fisheries. 

 The scheme proposed will be shown on a Chart. 



Both these schemes are to be regarded as preliminary to the possible laying 

 down of a comprehensive programme for a period of years. 



It is considered desirable to invite France to join with Ireland and England 

 in a joint programme for the investigation of the S.W. Area so that a preliminary 

 survey may be made of the area concerned at an early date. 



Current Measurements. 



5. A discussion will be invited as to the value of the methods so far used 

 and the results of the current measurements hitherto obtained by the International 

 Council. If agreed, a resolution can be framed that the Bureau should undertake 

 a critical examination of existing material as a guide to further co-operation. 



The following proposal is submitted for discussion : — 

 "It is desirable that intensive current measurements lasting at least a full 

 year be carried out with the object of tracing the monthly fluctuations of the 

 Resultant current of the Channel Stream into the Flemish Bight, and that 

 the Bureau be asked to report upon these observations." 



A memorandum deahng with some preliminary results will be circulated 

 for the consideration of the Section. 



The Hydrographical Bulletin. 



6. It is suggested that considerable cost of printing would be saved by 

 adopting the principle of printing in detail only those surface observations of sahnity 

 and temperature which form part of a vertical series of sub-surface observations. 



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