THE 



SCIENTIFIC PROCEEDINGS 



^ OF THE 



ROYAL DUBLIN SOCIETY. 



Yol. XII. (I.S.), lo. 18. JULY, 1909. 



METEODS OF DETEEMINING THE AMOUNT OF 

 LIGHT SCATTERED FROM ROUGH SURFACES. 



W. F. BARRETT, F.R.S., 



PROFESSOR OF EXPERIMENTAL PHYSICS, ROYAL COLLEGE OF SCIENCE FOR IRELAND. 



[ h uthors alone are responsible for all opinions expressed in their Communicallons.~\ 



DUBLIN : 



1'U15L1SHED BY THE ROYAL DUBLIN SOCIETY, 

 LEINSTER HOUSE, DUBLIN. 



WILLIAMS AND NOEGATE, 

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



1909. 



Price Sixpence. 



