THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XVI. (jy.S.), M 8. AUGUST, 1920. 



THE CHANGE IN THE RIGIDITY OFr-NICKEL 

 WIRE WITH MAGNETIC FIELdI 



BY 



WILLIAM BROWN, B.Sc, ^ 



PROFESSOR OF APPLIED PHYSICS, ROYAL COLLEGE OF SCIENCE FOR IJIBLAND, DUBLIN ; 



AND 



PATRICK O'CALLAGHAN, A.R.C.Sc.L, A.I.C., 



DEMONSTRATOR OP PHYSICS IN THE SAME COLLEGE. 



[A uihors alone are responsible for all opinions expressed intheirCommunicaiions.'] 



DUBLIN : 



PUBLISHED BY THE EOTAL DUBLIN SOCIETY, 



LEINSTEK HOUSE, DUBLIN. 



WILLIAMS AND NOEGATE, 

 14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. 2. 



1920. 



Price Sixpence. 



