143 



Equipment 



The Nansen bottles were used, as noted previously, for 

 obtaining subsurface samples. Reversing thermometers were 

 placed on each bottle in order that the temperature and density 

 of the water sampled at particular levels could be determined. 

 The water samples collected during the bacteria studies were 

 obtained with a slightly modified Zobell Bacteria Sampler. 



Additional Sources of Salinity Data 



Personnel of the Los Angeles City Bureau of Sanitation, 

 directed by C. G. Gunnerson, have collected numerous water 

 samples in Santa Monica Bay during the past two to three 

 years. Chlorinities were determined by silver nitrate 

 titration, but a potentiometric end -point was used. The 

 chlorinities obtained for identical water samples by both 

 Hyperion and Hancock Foundation show that the values differed 

 by about 0„06 o/oo, or about 0,11% in salinity (Table VII). 

 This is a rather large difference, and in any future work the 

 two methods should be more carefully compared and the source 

 of error eliminated. 



Some salinity data gathered by the Scripps Institution 

 of Oceanography were examined, but their stations lay beyond 

 the area of investigation in almost all cases. 



Salinity Data for Shelf Water 



Vertical Variation 



The vertical chlorinity variation in the bay as a »rtiole 

 is shown in Figure 72, in which the chlorinity is plotted 

 against depth for the shelf water down to 300 feet. 



