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XXVII. Anomalous Zeeman Effect in Satellites of the Violet 

 Line (4359) of Mercury. By H. Nagaoka, Professor of 

 Physics, and T. Takamine, Graduate in Physics, Imperial 

 University, Tokyo *. 



[Plates III. & IV.] 



mTIHE changes wrought by magnetic fields on the satellites 

 JL of spectrum lines are generally different from those 

 observed in the principal line, both as regards the modes of 

 separation and in the distribution of intensities among the 

 different components. The effect is in these respects mostly 

 anomalous, if we follow the course of satellites to strong 

 fields, although some regularity usually observed in simple 

 lines may still be traced in fields of a few thousand gauss. 

 The present paper is a continuation of the experiments | 

 made on the satellites of the green and violet lines X 5461 

 and X 4047 respectively, to those of X4359. The study of 

 this line is specially interesting as it is accompanied by more 

 than ten satellites, whose displacements in magnetic fields are 

 so diverse, that different cases of anomalies already noticed 

 in the satellites of two lines above mentioned are also found 

 in those of X 4359. 



The method of observation was exactly the same as that 

 already described in our former paper, so that it will be 

 unnecessary to enter into its details. Briefly speaking, the 

 position of satellites with respect to the principal line in 

 magnetic fields was determined mostly from photograms 

 taken with an echelon grating, and the course of the curves 

 giving the transition of the satellites was traced from those 

 obtained in heterogeneous fields. Some doubtful cases were 

 also examined in the photograms of interference points, 

 obtained either by combining the echelon grating with the 

 Lummer-Gehrcke plate or with the Fabry-Perot inter- 

 ferometer. Owing to the great complexity in the distri- 

 bution of the satellites, it was only after various examinations 

 of 180 photograms that the displacements of the satellites 

 were finally settled. 



Typical photograms showing the lines in uniform and 

 heterogeneous fields are shown in PI. III. 



Fig. 1 a and fig. 1 b show comparisons of the lines X 5461 



* Communicated by the Authors. 



t Nagaoka and Takamine, Phil. Mag. xxvii. p. 333 (1914V 

 Phil. Mag. S. 6. Vol. 29. No. 170. Feb. 1915. R 



