894: Prof. W. H. Bragg on the Intensity of 



Fig. 6. 





8 30 



55 



59 W 



45 



Fig. 7. 



"Principal Imodium Lint 

 DiainoncL (i i 0- 



"?Lrst and J*urd Orders 

 compared. 7h.ird Is 

 ina.gnlf-ie.ai ^ive times 



8°25' 35' 4^" 2 60 - 25 35' 4-5' 55' 



