PHILOSOPHICAL TRANSACTIONS 
OF THE 
ROYAL SOCIETY OE LONDON. 
Series A, Yol. 214. Pp. 359-371. 
[Plates 6-7.] 
THE SPARK SPECTRUM OF NICKEL UNDER 
MODERATE PRESSURES. 
BY 
E. G. BILHAM, A.R.C.Sc., B.Sc., D.I.C., 
RESEARCH STUDENT AT THE IMPERIAL COLLEGE OF SCIENCE AND ECHNOLOGY. 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY, 
AND SOLD BY HARRISON AND SONS, ST. MARTIN’S LANE. 
DULAUj AND CO., LTD., 37, SOHO SQUARE, W. 
1914. 
A 519. 
9.10.14 
Price One Shilling and Sixpence, 
