200 



REPORT 1892. 



Calcium (Arc Spectrum) — continued. 



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

 frequencies (in ail") can be calculated, very nearly, from the formula 



8 \ 



10 ^ = '^ - in--~c)i~\ where « = 33919-51 for fhe first line, 34022-12 for the second, 



and 34073-82 for the third line of the triplet, J =123547, ^ = 961696, in the triplets 

 marked * ; and in those marked f a = 34041-17 for the first line, 34146-95 for the 

 second, and 3419909 for the third, J = 120398, c = 346097. The figure preceding the 

 sign * or f sho-ws the value of v. 



§ Double; — calcium and iron. 



d Double. 



t Triple. 



