1920. No. 2. 



ON THE X-RAY SPECTRA. 



19 



First Possibility. One M ring. 

 In this case we put into equation (11.) 



' = 3> »-^ 3. »4 = 4, ^>3 = 10, 

 and we get: 



4* ('/4) - '/4 = ^ ^ i'/3) — 73 + 7,78 — 8 5 ... (16) 



Taking B to be in the interval 2,1 <ß<2,5, 73 must be in interval 



I2<';3< '4- 



Now in order to determine the frequency, we should know the 



value of 74 exactly. But this number cannot be exactly found by means 



of .V,, 



In the table IX will be found the values of B and C, correspondmg 

 to some of the best combinations of q-i aud 74. 



Table IX. 



In the table X are given the values of ''-, corresponding to the above 



values of B and ('. In the case of the combination (73 = 12, 74 = 8) the 



corrected values of ..have been calculated and put up in the fifth column, 

 Jx 



Finally *", has been calculated from the observed wave-length. 



Table X. 



