ny: 
following results were obtained for the lines pre b 
the unit of measure being pagahso00 Of a Paris 
B 2539-78 b  1916:50 A 1467'18 
C 2426-29 F 179727 H, 1453-98 
D 2178-59 G 1592-34 — see ee 
E 1948-24 
we difference in wave lengths for the two D lines was 2°226; between 
e two E lines only 0°395. (The numbers given above doubtless refer 3 
1a "he least refrangible lines in the cases of — nd E.) The author gives 
a careful discussion of the results of the two series of measurements 
made by Fraunhofer, and arrives at the see ees that the. measure = 
ments made with Nobert’s ruled glass deserve the greater degree of conti- 
dence. The following table gives the results of Angstrém’s determi 
tions of ee wave lengths of other lines in the spectrum, the unit 
the sam 
FS OnwP 
ee 
s 
2012 1; 19984 Tron. 
2426°26 12. 858 “ strong. 
2312°2, a strong atmospheric S634 
ine. §45 2° faint. 
2287°3 ) 83°5 “ ? 
a A group of strong — 25 abe - souls 
69-4 produced = HOR 455. ga4.: 4 
67-7. |. 80d calcium 16. 653  “ 
62°1 17s 10632 <4 é 
nee E 1948:44 Tron and calcium. 
= 2177- 48 3 { sodium lines, 46°8 “ 46 double. 
‘1. 2076-1 Iron, 84°6 oe Sat 
os = 
3. ouble. 
ss he b 191030 Magnesve 
hoes b 2°39 
a b, jer stewal magnesium 
ee 10°49 { Iron. 
tee beg Gg4 2 
Gee He é 1832-10: * 
7% : “419-1 . 
Fe: 184 
