202 



REPORT — 1892. 



Zinc (Aec Spectrum) — continued. 



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

 frequencies (in air) can be calculated (very nearly) from the formula 



IQ"^ = a ~hn--- en-*, ivhere a = 42945-82 for the >-s« line, 43331 71 for the seeond, 



A 



and 43521-48 for the third line of the triplet, & = 131641, <;= 1236125 in the triplets 

 marked * ; and in those marked t a = 42954-59 for the prst line, 43343-65 for the 

 second, a.nCi 4353332 for the third, ft = 126919, c= 632850. The figure preceding 

 the sign * or t shows the value of n. 



§Ames. 4810-7, 4722-3, 4680-3, 46301,3346-2, 33457, 3345-1, 33031, 3302-8, 

 3282-35, 3076-1, 30721, 3035- 9, 3018-5, 2800-9 (double), 2770-9 (double), 2756-5, 2712-6, 

 2684-2, 2670-7, 26087, 2582-5, 2570-0, 2516-2, 2491-6, 2479-9, 2463-7, 2440-4, 2429-0, 

 2138-3. X See Iron. || See Cadmium. 



Strontium (Arc Spectrum). 

 Kayser and Runge (* Ueber die Spectren der Elemente,' Pt. IV. 



Berlin, 1891). 



Wave-length 

 (Rowland) 



6550-53 



650417 



6408-65 



6386-74 



6380-95§ 



5970-38 



584801 



5817-01 



Limit 



of 

 Error 



Intensity 



and 

 Character 



Previous 



Measurements 



(Angstrom) 



6550-3 Thalen 



6501-8 



6407-3 



6387-3 „ 



6380-3 



5970-7 



5860-1 



5816-0 Huggins 





absent 

 6.504-35 

 6408-80 



absent 

 6380-94 

 5970-27 



absent 

 5817-05 



