398 



REPORT — 1893. 



CoPPEB (Aec Spectrum) — continued. 



The lines marked 4* 5* and 6* form a series of pairs, of which the oscillation 



frequency can be calculated from the formula 



10" - = a- 



A 



hn~- — cn-*, where 



^1 = 31591-6 for the first line, and 31840-1 for the second line of the pair, Z»= 131150, 

 c = 1085060. For those marked 4t and 5t the values are a = 31691-6 or 31840-1, 

 J = 124809, c = 440582. 



Silver (Arc Spectrum). 

 Kayser and Runge (' Ueber die Spectren der Element e,' Ft. VI. Berlin, 1892). 



