Magnetic Separations of the Lines of Iron, Nickel and Zinc in Different Fields. 49 



Of tliese lines, the wave-lengths marked with an asterisk 

 were measured for the first time. Most of these values are in 

 good agreement with King's result. 



(32) Conclusion, (i) Among the iron hues investigated in 

 different magnetic fields, 4404-75, 4383'55, 4307-92, 3886*29, 

 3878-78, 3859-90, 3856-38, 3815-84 3758-23 and 3749-47 are all 

 sharp triplets and their separations AX are linearly proportional to 

 the fields applied. Artliur King, using larger grating, also 

 showed that they are all triplets, (ii) 4415-13 and 3825'90 are 

 diffuse triplets, Arthur King took them for septuplets (?). In 

 these lines dX is proportional to H when the fields are compara- 

 tively low, and when the fields become higher, -^ become larger 

 than that in lower fields. 4325*78 and 3820*44 have similar features 

 to these two, although Arthur King thinks they are triplets. 

 3737*13 is also a line which King took for a septuplet and which I 

 observed as a diffuse triplet, as for example 4415*13 etc. The 

 data are too few in higher fields to compare it with 4415*13 etc., 

 but JX varies so irregularly that it is difficult to consider -^ as 

 constant, (iii) 3734-86 is taken for a septuplet by King, but in 

 my photography it is a sharp triplet and the mean value of 

 -^^ X 10^^= 13' 12 within 2% deviation from the mean, (iv) 

 3827*83 and 3763-80 are triplets and King is of the same opinion; 

 but —^ is not constant and these two lines have similar features, 

 (v) King reported 3719-93 to be a triplet (?), but in jnj photo- 

 graphs this line seems to be a sextet (?); AX can not be said to 

 vary linearly proportional to H. (vi) The lines from No. (20) to 

 (30) are not reported by King. According to my investigation, 

 AX does not vary linearly proportional to the fields in the case of 

 diffuse triplets and their features are similar to those which are 

 discussed in (ii). (vii) 2746*98 is a line whose violet side com- 

 ponent is fainter in intensity than the red side one. (viii) 

 3047*60 and 2756-31 are probably lines whose separations were 

 studied for the first time. 



