106 
THE ASTRONOMER ROYAL, CORRECTED WAVE-LENGTIIS 
The following Tables are to be substituted for those in pages 51, 52, 53, of the 
Memoir in the Philosophical Transactions, 1868. 
Conversion of Kirchhoff’s Spectral Measures into Wave-Lengths in terms of the Milli- 
metre, for the lines produced by Metals and Air. 
(The lines marked with an asterisk appear to coincide with dark lines in the Solar 
Spectrum) — Note by Kirchhoff. 
Kirchhoff’s measure. 
Corrected 
wave-length, 
m.m. 
o-ooo. 
Kirchhoff’s measure. 
Corrected 
wave-length, 
m.m. 
o-ouo. 
Ce 
1451-0 
53464 
1 
1190-1 
56467 
1 
1606-8 
52107 
2 
1249-9 
55727 
1 
1627-9 
51949 
2 
1256-7 
55645 
1 
1634-8 
51898 
2 
1329-1 
54799 
2 
2136-8 
48178 
1 
1332-4 
54764 
2 
1336-2 
54721 
1 
(La, Di) 
1385-0 
54170 
2 
1025-0 
58726 
1 
1401-7 
53988 
2 
1064-5 
58162 
1 
*1438-9 
53591 
3 
1066-1 
58141 
1 
1460-9 
53359 
1 
107M 
58067 
1 
1517-9 
52824 
3 
1075*6 
58007 
1 
from 1571-0 
52381 
1 1 
1077-0 
57988 
1 
to 1572-4 
52369 
i 3 
1092-1 
57776 
2 
1573-0 
52364 
2 
*1302-0 
55114 
1 
1623-1 
51984 
1 
*1303-4 
55097 
2 
from l629'2 
51937 
1 
1317”6 
54931 
1 
to 1630-4 
51931 
6 
1345-4 
54617 
1 
1683-1 
51544 
1 
from 1486-8 
531 10 
1 0 
1725-5 
51243 
1 
♦to 1489-2 
53087 
*1777-5 
50877 
2 
*1622-3 
51990 
1 
from 1782-4 
50843 
*1623-3 
51982 
1 
to 1784-5 
50823 
1 
1716-6 
51307 
2 
1938-8 
49780 
2 
1728-8 
51219 
2 
2052-3 
48899 
1 
from 1894-5 
50086 
1 0 
2221-5 
47473 
1 
♦to 1895-2 
50082 
i 2 
1903-0 
50027 
1 
Di 
1940-2 
49769 
1 
1225-0 
56028 
2 
from 1988-6 
49408 
l 1 
1230-0 
55966 
1 
to 1989-5 
49402 
i 1 
from 1364-5 
54402 
1 1 
2003-8 
49289 
1 
to 1365-2 
54394 
l 
2004-7 
49282 
2 
1431-9 
53664 
1 
2031-0 
49043 
2 
1471-1 
53261 
1 
2081-0 
48655 
2 
from 1518-6 
52818 
1 
1 
2121-4 
48314 
1 
*to 1519-4 
52810 
2208-2 
47587 
2 
1536-0 
52669 
1 
2214-5 
47533 
2 
1541-4 
52619 
1 
2217-8 
47506 
2 
1548-9 
52556 
2 
*1567-5 
52406 
1 
Pd 
1709-2 
51359 
2 
1114-7 
57460 
1 
*1146-2 
57038 
2 
La 
1164-9 
56789 
2 
from 3 411-6 
53885 
Q> 
1185-6 
56524 
1 
♦to 1412-8 
53871 
j 
1264-6 
55551 
2 
1416-8 
| 
53827 
2 
1269-0 
55489 
2 
