[August, 1898.J 



THE 



SCIENTIFIC TRANSACTIONS 



ROYAL DUBLIN SOCIETY, 



VOLUME VIL— (SERIES II.) 



L 



A DETERMINATION OF THE WAVE-LENGTHS OF THE PRINCIPAL LINES 

 IN THE SPECTRUM OF GALLIUM, SHOWING THEIR IDENTITY WITH 

 TWO LINES IN THE SOLAR SPECTRUM. By W. N. HARTLEY, F.R.S., 

 AND HUGH RAMAGE, A.R.C.Sc.I. 



(Plate I.) 



DUBLIN: 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY. 

 WILLIAMS AND NORGATE, 



H, HENEIETTA STEEET, COVENT GARDEN, LONDON ; 



20, SOUTH FEEDEEICK STEEET, EDINBUEGH; and 7, BEGAD STEEET, OXFORD. 



PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND WELDRICK. 



1898. 



