THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Yol. SIII. (I.S.), lo. 22. MAY, 1913. 



THE ULTIMATE LINES OF THE VACUUM-TUBE 

 SPECTEA OF MANGANESE, LEAD, COPPER, 

 AND LITHIUM. 



BY 



GENEVIEVE V. MORROW, A.R.C.Sc.I. 



[communicated by JAMES H, POLLOK, D.SC] 



(PLATE XXIV.) 



[>4 uthors alone are responsible for all opinions expressed in their Oommunications.'] 



DUBLIN: 



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