402 



REPORT 1893. 



Aluminium (Aeo Spectrum) — continued. 



Wave-lencth 

 (Rowland) 



2231-27 



% 2225-77 



r 2210-15 



f \ 2204-73 



\ 2199-71t 



^f 2174-13 



^ \ 2168-87 



„*/2150-69 



" \ 2145-48 



/ 2134-81 



X 2129-52 



/ 2123-44 



1 2118-58 



7t 



11* 

 12* 



Previous Measurements 

 (Angstrom) 



2210-0 L. & D. 

 2205-0 ,. 



2175-0 Cornu 



2169-8 „ 



2151-6 „ 



2146-4 „ 



2134-6 „ 



2129-4 „ 



2122-5 „ 



2117-4 „ 



Reduction 

 to Vacuum 



\ + 



14-2 

 14-3 

 14-4 

 14-5 



14-6 

 14-7 

 14-8 



14-9 

 15-0 



Oscillation 

 Frequency 

 in Vacuo 



44803-4 

 44914-0 

 45231-4 

 45342-5 

 454460 

 45980-8 

 46092-3 

 46481-9 

 4H594-8 

 46825-7 

 46943-9 

 47078-4 

 47186-4 



The oscillation frequencies (in air) of the pairs marked * can be calculated from 

 the formula 10"- = «_ J,i-2-e'«,-', when a = 48308-2 for the first line, 484202 for the 



A 



second line of the pair. & =15666-2 and c = 250533-1 ,- and for the pairs marked f 

 « = 48244-5for the first line and 48356-5 for the accowZ line, & = 127527 and c = 68781-9. 

 The figure preceding the sign * or f shows the value of n. 



Indidm (Arc Spectrum). 

 (Kayser and Riinge (' Ueber die Spectren der Elemente,' Pt. VI. Berlin, 1892.) 



X See Zinc. || See Cobalt. § See Iron. f See Thallium. 



** See Copper. 



