— 67 — COUNCIL-MARCH 1920-APPBNDIX 



The existing records, at any rate those of the Varne L. V., may be sub- 

 stantially influenced by the presence of sand banks the extent of which influence 

 it is impossible to estimate. If at any future date intensive current measurements 

 be undertaken to form an estimate of the flooding of the Flemish Bight with high 

 salinity water, the following conditions must be satisfied: — 



(1) A position other than the Varne L. V. must be chosen as remote as pos- 

 sible from sandbanks. 



(2) The meter must be self-recording and capable of sustained measurements 

 for at least 2 months. It should give current velocity and direction at intervals 

 not greater than half hourly. 



(3) The point of support of the meter must be well submerged and the meter 

 itself should be suspended to give as little "cant" as possible. 



(4) Provision should be made for the simultaneous measurement of vertical 

 water movements. 



(5) Observations should be continued over at least one year. 



Hydrographically speaking the waters of the English Channel and the 

 Flemish Bight are in the "Doldrums" during the summer season at which period 

 the Atlantic current is at minimal strength or ceases to flow. The fact that mea- 

 surable results of resultant currents have been obtained under summer conditions 

 is evidence of the possibility of securing satisfactory measurements to interpret 

 the way in which the highly salt water is projected through the Straits of Dover 

 into the Southern North Sea. 



It is possible that an experiment extending over one year will indicate that 

 it is only for a brief period during the waxing of the Atlantic Current that current 

 measurements have adequate value to warrant repetition year by year as part 

 of a general Hydrographical programme. 



(Signed) E. C. Jee. 

 25.2.20. 



a. Resultant currents. 

 For details and diagrams see [Fishery Investigations, Series III, Vol. IV, Part I, 



1920]. 

 A preliminary examination of the current meter data for August 1914 shows 

 that they consist mainly of observations worked up into vectors, spread more 

 or less irregularly over about 13 hours on consecutive days at stations along the 

 English line. The problem is to obtain resultant currents, i. e. drifts for each po- 

 sition. 



