198 



EEPORT — 1892. 



Magnesium — coniimied. 



The lines marked * and f form a series of triplets, of •which the oscilla- 

 tion frequencies (in air) can be calcvdated (very near!}') from the formula 



\ 



hn- 



■cn-\ -where a = 39796-10 for the first line, 39836-79 for the second. 



and 39857-00 for the tJdrd line of the triplets, J = 130398, c = 1432090 in the triplets 

 marked *; and in those marked f, a = 39836-74 for the first line, 39877-95 for the 

 second, 39897-91 for the third, &= 125471, c = 518781. The figure preceding the sign 

 * or f shows the value of n. 



Note. — Lines at 



4808-0, 38950, 3893-0, 3852-0, 3848-0 

 3073-6, 3050-6, 3046-7 



are given by Liveing and Dewar. 



Calcium (Arc Spectrum). 



Kayser and Runge (' Ueber die Spectren der Elemente,' Pt. IV. Berlin, 1891). 



