beach samples representative of that period of the je&r. The drilling 

 prograiti is scheduled for October when the beach will be largely free of 

 bathers and vacationistso It is not practicable to drill during the 

 summer when drilling operations may interfere with summer visitors to 

 Santa Barbara, 



2. Satisfactory progress has been made on the statistical 

 compilation of (l) the mechanical analyses of the samples collected last 

 year and (2) seasonal changes in the bottom profiles in the offshore 

 water at Santa Barbara as indicated by the surveys made by the University 

 of California during the past two years. 



Work Contemplated Dui'ing August and September 



The statistical compilation of existing data on bottom profiles 

 and mechanical analyses should largely be completed during the next two 

 months . 



II - A. Scripps Institution of Oceanography Quarterly Progress RePort No . 

 TT"," JaHuary - March 19^2~ 



SUBFiARINE GEOLOGY 



_S_elf °°Contained Diving Gear 



Experiments in tiie use of the self-contained diving gear (Aqua- 

 lung) are being continuedo Diving is carried on principally by graduate 

 students^ and promises to be a valuable tool in studying underwater pro- 

 cesses. Divers using this gear have already proved useful in orienting 

 and handling uSuch underwater equipment as sediment traps and coring devices, 

 and in observing the functioning of these devices under various conditionSo 



Recently, emphasis has been placed on improving undei-water photo- 

 graphy techniques 5 including the development of an underwater exposure 

 meter. The meter gave correct exposure for film at depths of 20 feet, and 

 resulted in good Kodachrome transparencies. The existing underwater camera 

 case has been improved and tested to a depth of 50 feet. Also, a waterproof 

 case has been built for a stop watch, and tested to depths of 1^0 feet. 

 The stop xiratch has been used to time surges on the bottom, and the growth 

 and decay of ripple marks. 



Orbital Current Meter 



The investigation of the orbital motion associated xfith shallow- 

 water waves mentioned in earlier progress reports is being continued. The 

 instrument employed consists basically of a Beryllium-copper rod, 25 cm. 

 long, with one end mounted rigidly to a tripod. The moving fluid produces 

 a bending of the rod which is interpreted in terms of velocity by the change 

 in resistance of strain gages cemented to the rod. 



U 



