﻿Zeeman Effect in Satellites of Violet Line of Mercury. 245 



3X 2 _ 



Or 



magnetic field. If Runge's rule be strictly obeyed, ^~ 



and ^-^=4. The agreement is not therefore so close as 



with the green line. Whether this discrepancy is to be 

 attributed to the fine structure of the assumed principal 

 line or not is an important question. When we recollect 

 that the green line has similar structure and still obeys 

 Runge's rule, we cannot at once answer the question 

 positively. 



Satellites. — The displacements of the satellites were mea- 

 sured by taking the branches of the sextet as reference lines. 

 Unfortunately the finite breadth of these brandies makes 

 the line somewhat vague, so that micrometric measurements 

 were not entirely free from the error of pointing, especially 

 in low fields. 



As already noticed in our former paper, the ^-components 

 are simpler than the ^-components. The distribution of linesin 

 the photograms of X 4359 is very intricate, and the tracing of 

 points lying on the curve representing the displacements 

 presents extreme difficulty, but we believe that the principal 

 feature of the mode of separation has been deciphered, 

 except for faint satellites or for those lying very near the 

 quartet P ±2 , P+3, of the principal lines, which are far 

 superior in intensity and obscure the traces of satellites. 



The general feature of the ^-components is shown in 

 fig. 7, PL TV., and of the ^-components in fig. 8, PL IV. It 

 will be noticed at a glance that the Zeeman effect of the 

 satellites is almost without exception anomalous. As was 

 already shown with the lines \ 5461 and X 4047, the anomaly 

 appears either as a dissymmetry in the intensity of the 

 displaced lines, or as deviations from the law of linear propor- 

 tionality of the amount of displacement to the magnetic 

 field. These two features are also characteristic of the 

 satellites of the violet line \ 4359. 



The observations of the displacements of different satellites 

 are given in the following tables. The lines in which the 

 displacement S\ is proportional to the field H are first 

 tabulated. When this condition is not satisfied, the displace- 

 ment is generally represented by an hyperbolic curve, which 

 is given by 



Sometimes 6 = 0, and the curve becomes parabolic. 



