708 



Mr. H. G. J. Moseley on the 

 Table I. 





a line. 

 X X 10 s cm. 



Qk- 



N. 

 Atomic 

 Number. 



(3 line. 



xxio 8 . 





8-364 

 7-142 

 4-750 

 3-759 

 3368 

 2-758 

 2-519 

 2-30]. 

 2-111 

 1-946 

 1-798 

 1-662 

 1-549 

 1-445 

 0-838 

 0-794 

 0-750 

 0-721 

 0-638 

 0-584 

 0-560 



1205 



1304 



1600 



17-98 



19-00 



20-99 



21-96 



22-98 



23-99 



24-99 



26-00 



27-04 



28-01 



2901 



38-1 



39-1 



40-2 



41-2 



43-6 



45-6 



46-6 



13 



14 

 17 



19 

 20 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 39 

 40 

 41 

 42 

 44 

 46 

 47 



7-912 

 6-729 



3-463 

 3 094 

 2-524 

 2-297 

 2093 

 1-818 

 1-765 

 1-629 

 1-506 

 1-402 

 1-306 



Silicon 





Potassium 



Calcium 



Titanium 



Vanadium 



Chromium 



Manganese 



Iron 



Cobalt 



Nickel 



Conner 



Zinc 



Yttrium 



Zirconium 



Niobium 



Molybdenum 



Ruthenium 



Palladium 



Silver 





spectra both of K and of CI were obtained by means of 

 a target of KC1, but it is very improbable that the observed 

 lines have been attributed to the wrong elements. The 

 a. line for elements from Y onwards appeared to consist of a 

 very close doublet, an effect previously observed by Bragg * 

 in the case of rhodium. 



The results obtained for the spectra of the L series are 

 given in Table II. and plotted in fig. 3. These spectra con- 

 tain Hve lines, a, /3, 7, 8, e, reckoned in order of decreasing 

 wave-length and decreasing intensity. There is also always 

 a faint companion a! on the long wave-length side of a, 

 a rather faint line <£ between j3 and 7 for the rare earth 

 elements at least, and a number of very faint lines of wave- 

 length greater than a. Of these, a, /3, 0, and 7 have been 

 systematically measured with the object of finding out how 

 the spectrum alters from one element to another. The fact 

 that often values are not given for all these lines merely 

 indicates the incompleteness of the work. The spectra, so 

 far as they have been examined, are so entirely similar that 

 without doubt a., j3, and 7 at least always exist. Often 7 was 



* Brag-g, 'Nature/ March 12, 1914. 



