173 



tidal relationship and the directions of flow appeared to 

 shift almost erraticallyo It was obvious that a program of 

 current meter observations would yield useful information 

 only if more accurate meters could be obtained and if a 

 relatively elaborate program could be developed by which 

 the entire bay would be covered at frequent intervals. The 

 suggestion was made that self-contained, automatic recording 

 meters be used„ Even provided that their sensitivity was 

 adequate, the problem of obtaining and installing such meters, 

 quite aside from the time required to analyze the results, 

 proved insurmountable within the limits of time and personnel 

 available to the Hancock Foundation, It was therefore 

 decided that current meter observations be curtailed. 



Drogues 



Early in the survey it was suggested that drogues be 

 used, particularly to check the behavior of subsurface currents, 

 Undoubtedly, a series of carefully planned drogue experiments 

 would furnish much information obtainable in no other way, 

 but here again other committments made it necessary to 

 eliminate or severely curtail such an investigation. However, 

 a number of drogues were tracked for periods of several hours 

 during the period from May 4 to August 20, 1956, primarily 

 to see if concepts of currents based upon temperature distri- 

 bution in shallow water were ¥alid. 



The drift paths of the drogues are shown graphically on 

 the charts of horizontal temperature distribution, but are 

 summarized in Table VIII, 



