THE i^iW YOKi^ 

 September, igi2 ACADEMY OF SCIEMC^'^ 3 



PROCEEDINGS 



ROYAL IRISH ACADEMY 



Volume XXX, Section A, No. 3 



ROBERT JACK 



MAGNETIC RESOLUTION OF 

 THE SPECTRUM LINES OF NIOBIUM 



DUBLIN 



HODGES, FIGGIS, & CO., Ltd. 



LONDON : WILLIAMS & NORGATE 



I912 



Price Sixpence 



