COUNCIL - MARCH 1920 - REPORT — 52 — 



Tidal Observations. 

 Dr. Witting proposed that the Section would consider the possibihty of 

 making the observations of the Sea-level more attainable and the use of these 

 for the Study of the currents etc. A Sub-Committee was formed for this purpose. 

 The meeting then adjourned. 



(Signed) E. C. Jee. 



Second sitting: Thursday, March 4th 1920. 

 Prof. VAN EvERDiNGEN in the Chair. 



Proposal of Prof. Knudsen. 



Prof. Knudsen outlined his memorandum to the Bureau who invited thç 

 opinion of the Section in regard to the work which should be carried out during 

 the year 1920^ — 21 by the hydrographical department of the Bureau. He stated 

 that the General Secretary had asked him to do so, and not to invite the section 

 to enter upon wages and other financial matters mentioned in the memorandum. 



The Section considered the various details of Prof. Knudsen's Memorandum 

 and recommended as follows : — 



1. That mean decade sea temperatures should be worked up on the 

 completion of the material; 



2. That ice material and its influence on the temperature of the fol- 

 lowing year should be worked up, if time permits; 



3. That if possible a Hydrographical Bulletin for the period 1915 — 19 

 should be prepared. 



Prof. Pettersson announced from the Bureau that it was decided to appoint 

 a Redactor for each of the Bulletins and that a meeting to decide pubhcation methods 

 would be convened tomorrow. 



The discussion of the British hydrographical proposals was then resumed. 



3. Instruments. 



Sweden. Dr. Hans Pettersson described new forms of total immersion 

 Hydrometers costing about £ 10 each for use where the salinity range was rather 

 high. A description of these appears in the "Monthly Weather Review" (English) 

 for February 1919. The meeting expressed general approval. 



France. It was hoped that a demonstration of the Favé tidal gauge would 

 be given before the close of the meeting. 



England. Mr. Wollaston gave an account of the principles of a continuous 

 recording current meter which the meeting recommended to Sweden for construc- 

 tion and trial. 



