IRRADIANCE IN pWATTS/cm^ 

 -J 



en 



a: 



S 



I 

 I- 



100 



FIGURE 6.2o 

 IRRADIANCE AS 

 FUNCTION OF 

 WAVE LENGTH 

 AND DEPTH 



150- 



«0%T 



200- 



250- 



4 00"<y 



300L 



course, from salt water. Pressure effects are minor, particularly 

 if one gets new batteries before some of the moisture has evapo- 

 rated from the mix within the case. However, at the ocean bottom 

 where tennperatures may approach C. , one should expect to 

 lose something like 20 percent of the capacity which batteries have 

 at 23 C. Mercury cells are so complex that I think a word of 

 warning should be given to test each and every batch because chan- 

 ges in construction and things of this sort make them either suitable 

 or not suitable. Many of them will utterly refuse to perform at 

 temperatures much below room temperature and become very erra- 

 tic. In fact, we had a rather sad experience that cost us a good 



51 



