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Underway Observations 



Precision depth recordings 

 Gravimeter recordings 

 Magnetometer total field 



intensity recordings 

 Bathythenuograms 

 Seismic reflection 

 Surface water temperature 



Station Operations 



Seismic refraction profiles 



Underway Observations 



Gravity cores 



Hydrographic casts 



Large- volume samples for C^\ IP, 



Sr, Cs 

 Microbiological sampling 

 Plankton sampling 

 Bottom trawling for biological 



specimens 

 Sound velocity and transmission 



measurements 

 Bottom temperatures and temperature 



gradients 

 Bottom dredging for rocks 

 Bottom photography 



In Port Observations 



Investigators 



Bruce Heezen 

 J. L. Worzel 



J, R. Heirtzler 

 R. Gerard 

 J. I. Ewing 

 M. Ewing 



(Charles Drake 

 (John Ewing 

 (John Naf e 



C, Fray 

 R, Gerard 



W. Broecker 



P, R. Burkholder 



Alan Be / 



Alan Be 



John Ewing 



M. Langseth 

 C. Fray 

 M. Ewing 



Rock collections 



C. L. Drake 



UNIVERSITY OF RHODE ISLAND 



Under Dr. John A. Knauss, the Narragansett Marine Laboratory of the University 

 of Rhode Island carried out two three-month studies of the equatorial current 

 circulation in the Indian Ocean aboard the R/V ARGO, whose cruise itinerary 

 has been given above. Planned locations of the sections are shown in Figure 9« 

 Results have been reported by Knauss and Taft (1963, 19Gk). 



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