

New Tabli 



i of Standard Wave-lengths. 



67 



Elements. 



In Arc. 



In Sun. 



Kind 

 of 



Stand- 

 ard. 



Weight. 



Wave- 

 length 

 in Arc. 



Wave- 

 length 

 in Sun. 



Inten- 

 sity. 



Appear- 

 ance. 



Inten- 

 sity. 



Appear- 

 ance. 



In 



Arc. 



In 



Sun. 



Fe 



Fe 



Or 



Cr 



Fe 



Fe?l ... 

 1474 I* 

 Co?J ... 



Fe 



Fe? 



Ca 



Tht 



Fe-Mj... 

 ? 



Fe(Co)T§ 



Fe 



Fe 



m 1 1| 



Fe-Cr/ 



Fe 



Fe 



Fe 



Fe 



Fe 



Fe 



Cr 



Fe 1 ... 

 Vaj ... 

 Val ... 

 Fej ... 



5 

 2 

 6 

 2 

 3 



".} 



9 



3 



7 



75 

 3 3 



i'"3 

 ? 

 4 

 4 



2 

 9 2 



2 



6 



3 



4 



7 



7 

 10 



1} 



1} 



B 

 d 



t? 

 B 



6 

 2 

 4 

 3 

 4 



4 1 



6 



3j 



8 



4 



5 



"i 



2 



1} 



6 

 6 



21 



3 



6 

 4 



5 

 7 

 7 

 5 



6 



7 



- 



d 



d 



d 



O" 



0" 



0" 



0" 



©" 



O 







O 



0" 



0' 



M0 



M 



I 1 



o 



0i 

 0" 

 O" 



0, 



0" 

 0" 

 0" 

 0" 

 0" 

 0" 

 O" 



0" 

 0" 



"i 



2 



"i 



i 



11 

 12 

 12 



9 



10 

 1 



7 

 1 

 8 

 9 

 4 



*8 

 7 

 5 

 1 



8 

 8 



8 



9 

 11 

 11 

 11 

 12 

 14 



7 



12 

 10 



5349-599 

 5350-670 



5397-319 

 5405-979 



5283-803 

 5288-708 

 5296-873 

 5300-918 

 5307-546 

 5316-790 

 5316870 

 5316-950 

 5324-373 

 5333092 

 5349-623 



5353-592 

 5361-813 

 5363011 

 5363-056 

 5367-670 

 5370-165 



5371-686 



5379-776 

 5383-576 

 5389-683 

 5393-378 

 5397-346 

 5405-987 

 5410000 



5415-421 

 5424-284 



* The distance apart of the components of this 1474 line measured accurately 

 is - 146 by Crew, and 0-141 by Eowland. The coincidences with Fe and Co are 

 very doubtful. The Co line comes more nearly between the two rather than 

 coinciding with either. (R.) 



A trial of substances in the arc gave the following results : — iron, manganese, 

 chromium, titanium, and two different specimens of meteoric stones showed 

 two faint lines having the same relative intensities with respect to each other as 

 the components of 1474 in the solar spectrum, and either coincided with the 

 components of 1474 or nearly so. When cobalt and nickel were tried, the lines 

 were the same distance apart but the relative intensities were reversed, the red 

 component being much the stronger. 



With the best definition 1474 is a triple, or rather a double the red compo- 

 nent of which has a weak side line to violet. The components as measured on 

 a photographic plate are respectively 0-120 and 0"050 apart. The main com- 

 ponents as determined by a series of measurements on photographic plates are 

 0-170 apart, 



Probably the violet component of the double is iron and the weak side line of 

 the red component is cobalt, but the red component is unknown. (J.) 



t With but little material in the arc this is a difficult triplet. The violet 

 component is very strong, the red component about half as strong, and between 

 them, but nearer the red component, is a very narrow line much weaker than 

 either of the others. (J.) 



| There are some fine lines near to red side. 



§ Components about 0-110 apart on photographic plates. (J.) 



|| Red component itself is an exceedingly difficult double. (J.) 



F2 



