992 
PROFESSOR J. N. LOCKTER ON THE PHOTOGRAPHIC 
elements other than iron are, in nearly ail cases, extremely faint. A list has been 
made of all the lines observed by Thalen, which are neither recorded by Kayser 
and E,unge, nor present in the Kensington photographs. 
Lines mapped by Thalen and not mapped by either Lockyer or Kayser 
and Rtjnge. 
Wave-length 
(Thalen). 
Intensity. 
Probable j 
origin. 
W ave-length 
(Thalen). 
Intensity. 
Probable ' 
origin. ' 
40697 
5 
Mn. 
5056-5 
6 
1 
4496-2 
5 
Or? 
5057-5 
6 
j 
4506-5 
6 
1 
1 
5080-6 
6 
1 
4544-0 
6 
(VorCo)? I 
5114-6 
5 
Ni. 
4590-1 
6 
5153-7 
6 
4683-7 
6 
5156-0 
6 
(Ni or Sr) ? 
4716-8 
6 
5209-5 
6 
Ti? 
4754-7 
0 
i 
5211-0 
6 
La? 
4758-8 
6 
Ti. ! 
5244-7 
6 
Mo? 
4779-8 
6 
5294-9 
6 
4848-8 
5-5 
5.325-9 
6 
4861-7 
5 ■ 
5326-6 
6 
4866-6 
6 
5590-8 
6 
4867-6 
6 
1 
5605-8 
6 
4873-0 
5-5 
Ni? 
5634-0 
5-5 
4873-7 
5 
5644-0 
6 
4874-3 
5-5 
5669-1 
6 
4896-8 
6 
5776-0 
6 
4897-8 
6 
Mil? 
5800-0 
6 
4900-1 
6 
5825-0 
6 
4924-9 
6 
5827-5 
6 
4943-7 
6 
5884-4 
6 
4974-7 
6 
Ni? 
5959-5 
6 
4985-3 
5-5 
6101-7 
4 
5024-0 
6 
Ti. 
6183-0 
6 
5030-3 
6 
6185-3 
6 
5052-2 
6 
(W or Ti) ? 
6303-5 
6 
5055-3 
6 
6306-0 
6 
5055-8 
6 
1 
Comparison 0/Kayser and PvUNGe’s Lines and Lines in the Kensington Photograp)hs. 
It appears from the tables that electrolytic iron does not give nearly so many 
lines as ordinary commercial metal. Bat the difference in number may be partly due 
to the use of different temperatures as well as difference of purity. The almost 
constant difference of O'l tenth metre between the two sets of measures is a satisfac¬ 
tory sign of mutual accuracy. As my measures are only carried to the nearest fifth 
figure, while those of Messrs. Kayser and Bunge are carried to six, such differences 
as those most frequently met with in the tables are only to be expected. All the 
lines in the regions taken in which the difference appears abnormal have been specially 
