304 
looked exactly like a reversed line, so that I supposed the s-triplet 
to be really a doublet of a reversed line, the two middle parts of 
which coincided. This appeared to be true when later on, probably 
through the increase of the self-induction, the s-triplet was trans- 
formed into an ordinary doublet, the p-doublet into a single line. 
Also a photo, made with an alloy in which there was less bismuth, 
presented this latter form, viz. an ordinary triplet. Compare also 
what Purvis says about this line. 
4260. 1 suppose that the same thing applies for this line as for 
3068. When the self-induction was carried up in order to get cer- 
tainty, this line became, however, too faint to allow us to draw 
conclusions. In favour of the supposition pleads that the splitting up 
of the p-components is as great as that of the s-components. 
4122. This is in my opinion a different case. Exner and HASCHEK 
give two lines here, 4121.75 and 4122.08, the latter slightly heavier 
than the former. I too find two lines with a distance 0.24 A.U., 
and the same ratio of strength. They do not look at all like one 
reversed line. The s-figure is a triplet which slightly changes in form 
when the circumstances change (see table). The difference in 
resolution between corresponding components in the two cases will 
no doubt be owing to the difficult and therefore unreliable observa- 
tion. | think, however, that the difference in distance on either side 
of the middle component actually exists. A triplet is recorded for 
the p-figure. There is a blurred faint line, which towards red, and 
also but still fainter towards violet fades over some distance and then 
ceases more or less abruptly. | think, however, that I see a separation 
in some places. The measurements are of course worth little. Purvis 
states 72.3 for the splitting up. This is about equal to what I found 
for the splitting up of the outer components of the s-triplet. 
4723. Wart MomamMmap gives a description of this line as far as 
its behaviour is concerned for weak magnetic fields, studied by the 
aid of an echelon.*) I myself find on the s records 2 middle com- 
ponents, by the side of each of which there is a broad smudge, 
which stops pretty abruptly. 
There is hardly any separation to be seen, which renders the 
measurement difficult. Nevertheless the different measurements of the 
outer components are in good harmony, those of the inner compo- 
nents not quite so good. The p-doublet is very close together, so 
that it is self-evident that a large comparative error arises there. 
') GH. Watt MonAmMMaApD. Untersuchungen über magnetische Zerlegung feiner 
Spektrallinién im Vakuumlichtbogen. Ann. d. Phys. (4), 39, 225, 1912: Diss., 
Göttingen, 1912. 
