PHILOSOPHICAL TRANSACTIONS 
OF THE 
ROYAL SOCIETY OE LONDON 
Series A, VOL. 208, pp. 333-347. 
[Plates 28-29.] 
THE CONSTITUTION OF THE ELECTRIC SPARK 
BY 
T. ROYDS, M.Sc., 
BEYER FELLOW OF THE MANCHESTER UNIVERSITY. 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY 
AND SOLD BY HARRISON AND SONS, ST. MARTIN’S LANK 
DULAU AND CO., 37, SOHO SQUARE, W. 
ERIEDLANDER AND SON, BERLIN. 
1908. 
A 435. 
25.7.08 
Price One Shilling and Sixpence. 
