162 Mr. J. Norman Lockyer. 



Calcium. 



Wave- length. 

 (K and E.) 



[ntensity in 

 flame (L). 

 Max. = 10. 



Intensity 



in arc 

 (K & E). 

 Max. = 10. 



Length in 

 arc (L). 

 Max. = 10. 



Intensity in 

 spark (T). 

 Max, = 10. 



Intensity in 

 hot spark 

 (L). 

 j Max. = 10. 



3706*18 







4 







8 



3737 '08 







4 







10 



K 3933-83 



3 



10 



10 



10 



10 



3949 -09 





4 







1 



3957 '23 







6 



2 





1 



H 3968-63 



3 



10 



10 



10 



10 



3973 -89 





6 



4 





2 



4092 -83 







2 



2 



2 



1 



4095-25 







2 





2 



trace 



4098 -82 







4 



4 



2 



1 



4226 -91 



10 



10 



10 



10 



5 



4238 -00 







2 







4240-58 





4 





2 





4283 -16 





8 



6 



8 



2 



4289 '51 







8 



6 



6 



2 



4299 -14 







6 



6 



6 



2 



4302 -68 



i 



10 | 



6 



10 



3 



4307 -91 





8 



6 



6 



1 



4318 -80 



i 



8 



6 



8 



2 



4355-41 





6 



4 





1 



4425-61 







10 



6 



10 



2 



4435 -13 \ 



i 



10 



} 8 



10 



1 



4435 -86 J 





8 



2 



I 3 

 j 



4454 -97] 



2 



10 



8 



10 



1 



4456 -08 V 





8 



1 



2 





4456 -81 J 







4 





| 



4508 -04 



- 



1 



bp 



— 





4509 -89 





1 





} 1 



4512 -73 





1 



! 2 



f* 



o 





1 



4527-17 





6 





1 



4578-82 









4 



1 



4581 -66 





8 



6 



4 



1 



4586 -12 





10 





4 



2 



4685 -40 





4 



J 







K & E = Kayser and Eunge, T = Thalen, L = Lockyer. 



written as follows in November 1872 :* " This is a very brillant 

 winged line, but it appears short. Thalen makes it of the same in- 

 tensity as the two at 4703'5 and 4586 - 5 ; but while this is excessively 

 bright to me, 4703'5 is faint and 4586*5 invisible." Taking b as 

 having a length denoted by 4, I gave the length of this line at 4481 

 as 1 ; I also stated that it was not seen in the spectrum of the 

 chloride, although the b group was distinctly seen. The line at 

 4481 has not to my knowlege been recorded by any observer as 

 present in the arc spectrum, but a recent photograph shows it as a 

 rather feeble lino in the arc between poles consisting of magnesium. 

 * « Phil. Trans.,' 1873, vol, 163, Part 1, p. 267. 



