( 739 ) 



in the middle, 7?, showed a doublet at a distance of 0,3, «ft; so the 

 aspect was about the same as that preliminarily sketched in § 7 ^). 



With a tield of 23 kgs. R^ showed a quadruplet, the four com- 

 ponents of which had about the same intensitj', and the distances 

 of which seemed slightly to decrease towards the violet. The inter- 

 vals were now as bright as the sj)ectral background ; only between 

 the pair lying on the violet side the interval seemed slightly darker; 

 the distance of the outer lines was 0,28 /«,«, and the mutual distances 

 differ little from a third of this. 7^^ also gave a quadruplet, the 

 two inner lines of which are much fainter than the outer ones, and 

 symmetrically distributed (without careful focussing of the magnifying 

 glass one may therefore feel inclined to see a doublet); the distance 

 of the outer lines was 0,285 mi respectively. 



With 30 kgs. the phenomenon was exactly equal, with distances 

 0,39 and 0,38 fxfi. 



With 36 kgs. R^ exhibited a quadruplet as above, further resolved. 

 From red to violet 

 I the distances of the middle lines 



I amounted to 0,15 0,145 0,14, total 0,435 mx 



/the widths of the lines „ 0,07 0,025 0,035 0,065 /i/-* 



The distance between the extreme limits amounted to 0,50 jift ; the 

 middle between them appeared to be displaced 0,04 nn towards the 

 violet with respect to the position with field off. 



For R^ on the other hand we obtained values for 

 I the distances of the middle lines 0,15 0,20 0,085, total 0,435^^1 

 I the widths of the lines 0,055 very narrow 0,045 mi. 



The distance of the extreme limits amounted to 0,47 im ; the dis- 

 placement of the middle with respect to the position with field off 

 was less than for R^ and could not be ascertained by measurement. 



Let (f/^i and óR^ stand for the total distances between the 

 outer quadruplet lines and Sp for the intensity of the field, then we have 



*) As was observed in § 7 the numerical determinations there bear a strictly 

 preliminary character; through a misprint the estimation of the intensity of the 

 field was 30 kilogauss: this should be 20 kgs. The data now given possess 

 already greater reliability ; they were eacli derived Irom 2 to 5 readings. 



