224 
REPORT—1890. 
Report of the Committee, consisting of Sir H. E. Roscor, Mr. J. N. 
Lockyer, Professors Dewar, WoLcoTt Gipps, LIVEING, SCHUSTER, 
and W.N. Hart.ey, Captain ABNEY, and Dr. MARSHALL WATTS 
(Secretary), appointed to prepare a new series of Wave-length 
Tables of the Spectra of the Elements and Compounds. 
Tue ‘ Table of Corrections’ given herewith has been obtained by a careful 
comparison of Professor Rowland’s photographic map of the solar 
spectrum with the maps of 
already given in these Reports are based. 
ngstrom and Cornu, upon which the tables 
Table of Corrections to be applied to reduce Angstrim’s and Cornu’s 
Numbers to the Standard of Rowland’s Map. 
Wave-length 
Above 6930 
From 6930 to 6880 
6880 to 6820 
6820 to 6800 
6800 to 6765 
6765 to 6720 
6720 to 6660 
6660 to 6230 
6230 to 6180 
6180 to 6155 
6155 to 6135 
6135 to 6130 
6130 to 6110 
6110 to 6080 
6080 to 6060 
6060 to 6000 
6000 to 5970 
5970 to 5810 
5810 to 5780 
5780 to 5610 
5610 to 5540 
5540 to 5485 
5485 to 5435 
5435 to 5350 
5350 to 5335 
5335 to 5325 
5325 to 5300 
5300 to 5175 
5175 to 5150 
5150 to 4990 
4990 to 4970 
Correction Wave-length Correction 
+17 From 4970 to 4935 +10 
+16 » 4935 to 4865 +0°9 
+15 » 4865 to 4740 +10 
+14 » 4740 to 4650 +0°9 
+13 | » 4650 to 4470 +0°8 
+12 | » 4470 to 4380 +0°7 
+11 » 4380 to 4170 +0°6 
+1:0 3 4170 to 4130 +07 
+0°9 » 4130 to 4100 +0°8 
+1:0 » 4100 to 4060 +07 
+11 », 4060 to 4040 +0°6 
+1:0 » 4040 to 3850 +07 
+0°9 », 3850 to 3730 +0°6 
+1:0 » 3730 to 3720 +05 
+1:1 » 3720 to 3660 +04 
+1°0 », 3660 to 3640 +0°8 
+0°9 » 3640 to 3620 +06 
+1:0 » 3620 to 3530 +0°5 
+0°9 » 3530 to 3480 +0°6 
+1:0 » 3480 to 3470 +0°8 
+1:1 » 8470 to 3440 +07 
+1-0 » 3440 to 3420 +11 
+0°9 » 3420 to 3360 +17 
+1:0 » 3360 to 3330 +25 
+09 » 3330 to 3290 +22 
+1:0 » 8290 to 3280 + 2:0 
+0°9 », 3280 to 3240 +1°9 
+1:0 » 3240 to 3220 +1:8 
+0°9 » 3220 to 3190 +0°8 
+08 » 9190 to 3160 +0-4 
+6°9 
yur Oh 
' 
: 
| 
The spectra of cobalt and nickel now given are upon Angstrém’s scale, 
but the absorption spectrum of iodine rests upon the numbers of the Pots- 
dam catalogue of 300 solar lines, the numbers of which agree very closely 
indeed with those of Rowland, as is seen in the following comparison :— 
Potsdam Catalogue Rowland’s Map 
C (Hydrogen) 6563'14 6563-042 
D,(Sodium) 5896-25 5896°156 
D,(Sodium) 589023. 5890°188 
E, (Iron) B2I00De feo 5270°497 
E,(Iron) oO is aee.. BORSGD 5269720 
b,(Magnesium) . - : - 5183:93 5183°798 
bin hohe Setter atne 16169:38 5169°159 
