Higli-Frequency Spectra of the Elements. 787 



there was no change in the anomaly after long continued 

 tension. Hence in this case the effect is probably due to the 

 bifilar property of the phosphor-bronze strips. 



In conclusion, I should like to express my obligation to 

 Prof. Wilberforce for suggesting the investigation and for 

 advice during the course of the work. 



LXXXV . The High- Frequency Spectra of the Elements. 

 By Ivar Malmer, Cand.phil* 



[Plate XIV .] 



IN his excellent researches on the high-frequency spectra 

 of the elements, Moseley f has analysed the character- 

 istic types of X-radiation of a great many elements. For 

 the elements aluminium-zinc in the periodic system he has 

 pro tempore examined and measured the wave-lengths only 

 of the characteristic K-radiation which has been found to 

 consist of two definite wave-lengths for each element. For 

 the elements yttrium-silver he has found and measured only 

 one wave-length, corresponding to the weaker one of the two 

 above-mentioned, and for these (with the exception of 

 yttrium) and a great many of the following elements he has 

 determined several wave-lengths of the characteristic radia- 

 tion that has been named L-radiation. A relation of the ut- 

 most interest among the frequencies of the radiation of the 

 different elements is, that they admit of being arranged in 

 series such that the square root of the frequency in each 

 series increases by a constant from element to element in the 

 periodic system. In all cases this relation seems to hold 

 good for the comparatively long waves, i. e. the so-called 

 L-radiation and the K-series of the comparatively light atoms. 



It must be of great interest to find out if the two K-series 

 can be followed on to the heaviest atoms and if the con- 

 stancy above-mentioned really continues throughout the 

 system, even for these short waves. In his research on the 

 line-spectrum emitted by platinum, M. de Broglie J did not 

 find any line corresponding to the K-series ; this may depend 

 either upon these series ending somewhere in the system or 

 upon the exciting cathode rays not being fast enough. 



This paper contains the description of an attempt to follow 

 the two K-series further on in the periodic system than has 



* Communicated by the Author. 



t Phil. Mag. xxvi. p. 1024: ; xxvii. p. 703. 



X C. K. 1. 158, p. 177. 



