Measurements of 'find Stress 



Eecords of water slope were obtained for a number of days, including 

 one series of continuous records for 21^ hours on 5 December, wherl wind 

 speeds reached 30 mph. During that day, detergent was added on five 

 occasions to still waves-. At .the higher sioeeds the effect of detergent 

 is to reduce the slope (and stress) 'qy one third. Measurements of wind 

 speed are now made at three elevations for each five-minute period. Much 

 of the data have been reduced, vifork is in progress to reduce the temperature 

 "noise" in the measurements, which is now the limiting factor in measuring 

 slope at low wind speeds, - 



SPECIAL DEVELOPMENTS 



Underwater Camera 



An underwater camera, used by the Division of Submarine Geology, 

 was rebuilt to permit increased load on gear train required for 

 unorthodox requirements of external controls. Modifications were 

 accomplished on the external case which included replacement of worn 

 parts and the addition of new control glands, A flash synchronizer 

 was added to the camera components, which require modification of the 

 camera for accommodation and at the same time additional leads through 

 the case for the electrical connections. 



Miscellaneous Shop Work 



Continued assistance was rendered in performing miscellaneous re- 

 pairs to Aqua -lungs during this quarter. 



PUBLICATIONS 



Articles Published 



Arthur, Robert S., Wave Forecasting and Hindcasting, Proc. of First 

 Conf* on Coastal Engineering, Long Beach, California, Oct 1950, 

 Ch, 8, SIO Wave Report No. 98, reprints distributed as SIO Reference. 

 51-56, 15 December 1951 » 



Munk, Tifalter H,, Origin and Generation of Yfaves, Proc, of First Conf, 

 on Coastal Engineering, Long Beach, Calif,, Oct 1950, Chapter 1. 

 SIO Wave Report No. 99, reprints distrubuted as SIO Reference 51-57, 

 15 Dec 1951. 



Shepard, Francis P., Sand Movement on the Shallow Intercanyon Shelf at 

 Ls. Jolla, Calif ornia , BEB Tech. Memo. 26, Nov 1951, SIO Submarine Geology 

 Report No. 21. ' 



Shepard, Francis P., Transportation of Sand into Deep Water, Soc. Ec, 

 Pal. & Min., Sp. Publ. No. 2, November 1951 



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