302 



On the Constituents' of Cleveite Gas. 



Series (b). 



Series (b r ). 



5876-206 



5875-883 



4471-85 



4471-66 



402652 



4026-35 



3819-89 



3819-75 



3705-29 



3705-15 



3634-52 



3634-39 



3587-54 



3587-42 



3554-5 



35306 



3512-6 



3498-7 



3487-8 



3479-2 



1/A. 



17017-78 



17018-72 



22362-11 



22363-06 



24835-34 



24836-39 



26178-76 



26179-72 



26988-44 



26989-46 



27513-95 



27514-93 



27874-25 



27875-19 



28133 



28324 



28469 



28582 



28671 



28742 



Hydrogen 

 1/A. 



15236-8 



20569-8 



23038-0 



24379-2 



25187-3 



25712-6 



26071-5 



26330 



26520 



26666 



26780 



26869 



26940 



. Differ- 

 ence. 



1781-9 

 1793-3 



1798-4 



1800-5 



1802-2 



1802-3 



1803-7 



1803 



1804 



1803 



1802 



1802 



1802 



A. 



6678-1 

 4922-08 

 4388-11 

 4143-91 



1/X. 



14974-3 

 20316-6 

 22788-8 

 24131-8 



Difference. 



5342-3 

 2472-2 

 1343-0 



s 



enes 



7065-77 

 7065-51 

 471339 

 4713-17 

 4121-15 

 4120-98 

 3867-77 

 3867-61 

 3733-15 

 373301 

 3652-29 

 3652-15 



(c). 



{continued). 



3599-59 



3599-45 



3563-26 



3563-11 



3536-9 



35175 



35025 



3490-8 



3481-5? 



Series (V). 



X. 



7281-8 

 5047 82 

 4437 73 

 4169-12 

 4024-14 

 3936-1 

 3878-3 

 3838-2 

 3808-3 ? 



Notes. 



1. The rays 1*120 fi and 2*040 //, were determined with the 



bolometer. 



2. Of these 1*120//,, the head of the Principal Series of 



helium gas, is the strongest line in the spectrum 

 produced by the mixture of the two gases. 



3. The first pair of the lines in Series (c) were determined 



photographically on specially sensitized plates. 



4. On the other hand, the position of the first line in 



Series (</) is from a preliminary determination by an 

 eye- observation made with a small Rowland's flat 

 grating. 



5. The hydrogen lines inserted for comparison with Series (b) 



are determinations by Ames ; see Phil. Mag. of July 

 1890. 



