c. 
PHILOSOPHICAL TEAJNTSAOTIONS 
OF THE 
ROYAL SOCIETY OE LONDON 
Series A, VOL. 201, pp. 497-549. 
THE ELECTEICAL CONDUCTIVITY IMPARTED TO A VACUUM 
BY HOT CONDUCTORS 
BY 
O. W. RICHARDSON, B.A., B.Sc., 
FELLOW OF TRINITY COLLEGE, CAMBRIDGE. 
LONDON: ’ , 
PUBLISHED FOR THE ROYAL SOCIETY 
BY DULAU AND CO., 37, SOHO SQUAEE, W. 
CONTINENTAL AGENTS, MESSRS FRIEDLANDER AND SON, BERLIN 
^ 1903. 
A 348. 20.7.&6 
Price Three Shillings and Sixpence. 
I 
