THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Yol. XV. (U.S.), No. 5. FEBRUARY, 1916. 



THE CHANGE OF LENGTH IN NICKEL WIRES 

 OF DIFFERENT RIGIDITIES, DUE TO ALTER- 

 NATING MAGNETIC FIELDS OF FREQUENCIES 

 UP TO 150 PER SECOND. 



BY 



WILLIAM BROWN, B.Sc, 



PROFESSOR OF APPLIED PHYSICS, ROYAL COLLEGE OF SCIENCE FOR IRELAND, DUBLIN. 



[A utiiors alone are responsible for all opinions expressed in their Communications.] 



DUBLIN : 



PUBLISHED BY THE liOYAL DUBLIN SOCIETY, 



LEINSTER HOUSE, DUBLIN. 

 WILLIAMS AND NORGATE, 



14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.G. 



1916. A^ 



i* NOV I 



Price Sixpence. \ a. 



