the Fluorescent Rontgen Radiations. 



411 



obliged to define the radiations by their absorption in some 

 standard substance. Thus we may represent the known 



Fiir. 4. 



2-8 



I 



§£■4 

 \ 



8 



<u 

 <*; 

 §1-6 



$ 













«v 





















































































V 













e X 



N, 















































N 







7-6 















\ 























N 



>^ 









60 80 100 120 140 160 



Atomic Weight of f~j.uo/i£SC£NT fL£f»£/vr. 



130 eoo 



S6 



Srx/Es K 



Fij 



S£R/£S L 



3a 



lo ?,o <?jt I * /9l/ 



portion o£ the spectra of elements Sb, I, and Ba as in fig. 5. 

 The lines move towards the more penetrating end of the 

 spectrum with an increase in the atomic weight ot the element. 



