r 



30 



THE 



SCIENTIFIC PEOCEEDINGS 



OF THE 



EOYAL DUBLIN SOCIETY. 



^tb ^txm. 



^-^ 



VOLUME XVI. ■'^ OG'l 2: 192? 



^ 'Signal f/luse^i; 



DUBLIN : 

 PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 



LEINSTER HOUSE, DUBLIN. 



WILLIAMS & NOR GATE, 



14 HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. 



1920-1922. 



