336 



B. W. G. Wyckojf — Crystal Structures of 



o is taken to be 2.65. The resulting curve for bromine is 

 also given in fig. 11. The curve for silver bromide then 

 is obtained by combining these two absorptions, remem- 

 bering that 108 grams of silver react with 80 grams 

 of bromine. '(Fig. 11.) The amount of X-rays absorbed 



Fig. 12. 



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by a convenient thickness of AgBr can be readily obtained 

 from this mass absorption curve and is shown in f^g. 10. 



Since there is an uneven distribution of energy in the 

 different wave lengths, the effect on the photographic 

 plate is to be obtained by combining this curve (fig. 10) 

 with wave length-intensity curves, like those of Ulrey 24 for 



24 C. T. Ulrey, op. cit, 



