[SEPTEMBER, 1904. | 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
IO SAIL, ID ICE IOIOIN tS OxO1 abe 
VOLUME VIII.—(SERIES IT.) 
X. 
THE PHOTOMETRY OF N-RAYS. 
BY 
F. E. HACKETT, B.Sc. 
DUBLIN: 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY. 
WILLIAMS AND NORGATE. 
14, HENRIETTA STREET, COVENT GARDEN, LONDON ; 
20, SOUTH FREDERICK STREET, EDINBURGH: anv 7, BROAD STREET, OXFORD. 
PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND GIBBS. 
1904. 
