[SepremBrr, 1904. | 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
noe DUB EIN SOCIHTY. 
VOLUME VIII.—(SERIES IT.) 
XG 
THE PHOTOMETRY OF N-RAYS. 
BY 
BF. EK. 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. 
Price One Shilling. 
a ma c le NM ines ® 
LAA onal} InSt ; 
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