478 
MR. J. EVERSHED ON THE SOLAR ECLIPSE OF 1900, .MAY 28. 
connecting two or more wave-lengths means that a shading extends between them, 
and jn-oljaldy indicates an unresolved group of lines. In many instances the whole 
group presents the appearance of a single wide line or band, and in these cases the 
intensity of the group as a whole is given. 
The intensities of the flash lines are, of course, entirely relative, and the higher 
absolute values obtained for No. 11 spectrum are simply due to the greater intensity 
of this spectrum as a wliole compared with No. 9 or No. 13. But since these higher 
values are probably more reliable than the others, the “adojMed” values are mostlv 
taken from No. 11 spectrum. 
In Talde II. the wave-lengths of the hjulrogen lines in each spectrum are compared 
in the 2nd, 3rd, and 4th columns. The mean values for the three sets of measures are 
entered in tlie 5th column, and these are coinjaared with the theoretical values 
computed from Balmer’s formula, given in the 6th column. The last column gives 
tlie diflerences, observation — calculation. 
-s- 
In the formula X = the constant a(=2741875) is derived from IIowlaxd’s 
measures of the lines a, /3, and y reduced to a vacuum, and the resultino- wave- 
lengths are corrected to air in accordance with a table of Bunge (‘ Astronomy and 
Astrophysics,’ vol. 12, No. 5). 
Table I.—Eclipse Spectra, May 28, 1900. 
Wave-lengths. 
Inrensitie,s. 
Adopted 
Remarks. 
Wave-length 
Jntcn 
No. 9. 
No. 11. 
No. 13. 
wave- 
sity. 
in sun 
sity. 
Element. 
Latitude 
Latitude 
Latitude 
No. 9. 
No. 11. 
No. 13. 
length. 
(Rowland). 
-74" E. 
-41° W. 
-75° W. 
1 
i 
- 
3488-90 
— 
10 
— 
3488 -9 
10 
3488-817 
4 
Mn 
— 
91 -31 
- 
- 
20 
— 
91 -3 
20 
91 -195 
5 
Ti 
1 
03 -CO 
_ 
_ 
5 
93-7 
5 
j" 93 -430 
1 93-834 
1 ) 
1 
Very indistinct (probable 
1 1 
— 
— 
— 
— 
— 
)■ f?roup) best on continuous 
spectrum 
— , 
— 
94-308 
y 
~ 1 
— 
95 -02 
— 
— 
5 
— 
95-0 
5 
94-815 
2 j 
96-39 
J" 96 -224 
\ 96 -348 
0 
Co V 
— 
— 
30 
— 
96-4 
30 
o 
Zr 
97-54 
10 
r 97 -668 
S 
Mn 
— 
— 
— 
Best on continuous spectrum . 
97 *0 
10 
I 97 -982 
8 
Fe 
3505-12 
— 
— 
20 
— 
3505-1 
20 
3505 ‘056 
— 
Ti 
— 
11-10 
— 
— 
30 
— 
Well defined. 
11 -1 
30 
10-985 
5 
Ti 
- 
12-40 
— 
— 
0 
— 
12-4 ± 
0 
— 
— 
— 
— 
i‘i*na 
— 
— 
0 
— 
13-0 ± 
0 
- 
— 
- 1 
— 
14 -22 
— 
— 
5 
— 
14-2 
5 
^ 13-965 
1 14-138 
7 
3 
Ec ; 
Ni 
— 
15-41 
— 
— 
5 
— 
15-4 
15 -206 
12 
Ni 
— 
17-49 
— 
— 
10 
— 
17 *0 
10 
17-446 
3 
V 
— 
20-40 
— 
— 
20 
— 
20-4 
20 
20 -397 
2 
Ti 
— 
3524-75 
— 
— 
10 
— 
Dark line on continuous spec- 
3524-7 
10 
3524 -677 
20 
Ni 
trum, bright line outside 
