PHILOSOPHICAL TRANSACTIONS 
OF THE 
ROYAL SOCIETY OF LONDON 
Series A, VOL. 208, pp. 111-162. 
[Plates 3-8.] 
THE EFFECT OF PRESSURE UPON ARC SPECTRA—No. 1. IRON 
BY 
W. GEOFFREY DUFFIELD, B.Sc. (Adelaide), B.A. (Cantab.), 
HONORARY RESEARCH FELLOW IN PHYSICS AT THE MANCHESTER UNIVERSITY, MACKINNON 
STUDENT OF THE ROYAL SOCIETY. 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY 
AND SOLD BY HARRISON AND SONS, ST. MARTIN’S LANE. 
DULAU AND CO., 37, SOHO SQUARE, W. 
FRIEDLANDER AND SON, BERLIN. 
1908. 
A 429. 
26.3.08 
1 
Price Three Shillings and Sixpence. 
