306 Mr. H. Eamage. Spectra of Potassium, Rubidium, [May 14, 



Potassium 





Oscillation 









1 



Series 



W aye -length. 



frequency, 



Intensity. 



Previous 

 measurement. 



Observer. 



and 





in vacuum. 







number. 



7697 



— 



Very strong 



5< 



7701 -92 



Lelimann 



Pi 



7664 



— 



7668 -54 



55 



Pi 



6939 



14407 



8 



6938 -8 



K. and E. 



1I 3 



13 



462 



7 



11 -2 



5) 



\ U| 



5832 '25 



17141 -3 



6 



5832 -23 



,, 





12 *53 



199 -5 



5 



12-54 



., 



! ^4 



02-12 



230 -8 



7 



02 -01 



55 



! IJ 4 



5782-74 



288 -1 



6 



5782 -67 



„ 



! H4 



5359 96 



18651-8 



4 



5359*88 



55 





43 -38 



709 -6 



2 .j 



43-35 



55 



h 



40-17 



720 9 



3 



40-08 



55 



n. 



23*68 



778 -9 



2 



23 -55 



55 



n. 



5112 -76 



19553 -1 



2 



5112 -68 



55 



r 6 



5099 -83 



602 -7 



1 



5099 -64 



'5 



"c 



97 '64 



611 -1 





97 -75 



„ 



I 6 



85 -07 



659 -4 



1 



84 -49 



,5 



n 6 



4965 -61 



20132 -5 



1 



4965 -5 



5' 



i 7 



4957 



167 



<1 



56-8 



55 



117 



51 -46 



190 -1 



1 



52-2 



>, 





4870 



528 



<1 



4870 -8 



L. and D. 



h 



62 



562 



<1 



63 -8 



» 



Us 



57 



583 



<1 



56 -8 



55 



-••8 



29 



702 



<1 









03 



814 



<1 



4803-8 





I 9 



01 



823 



<1 





_»_ 





4798 



836 



<1 



4796 -8 



L. and D. 





67 



972 



<1 









60 



21002 



<1 



4759 -8 



55 



T10 



4642 -35 



21534 -4 



2 



4642 



H. and E. 





38-6 



51 8 



<1 









4.04/7 -^Q 



24700 '3 



Q 



■iUi/ DO 





p i 



44-33 



*" 719-0 



10 



44-29 





P2 



3447 '56 



28997 -8 



3 



3447 -49 



55 



P 3 



6-55 



29006 3 



4 



6 49 





P 3 



Present 





<1 



3217 -76 



55 



P 4 



3217 -36 



31072 7 



2 



0-27 



i 



55 



P4 



Other lines, very feeble indeed, appear on the strong continuous spectrum in the 

 region near 4642. The line A 4642*35 was first observed in the spectrum of the 

 Bessemer flame ; Hartley and Eamage, ' Phil. Trans.,' A, vol. 196, p. 491, 1901. 



Diagrams of these spectra were drawn, as described in my former 

 paper, to scales of oscillation frequencies for abscissae, and (1) atomic 

 masses, (2) squares of atomic masses for ordinates. The conclusions 

 previously deduced from the less complete data were thereby amply 

 confirmed. There is undoubtedly a very close connection between 

 the spectra and the atomic masses ; and the lines, which connect the 

 corresponding members of homologous doublets in diagram (2), do 

 intersect on the line of zero atomic mass. 



