THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XV. (ITS.), lo. 33. OCTOBER, 1918. 



THE TWIST AND MAGNETIZATION OF A STEEL 

 TUBE IN A SPIRAL MAGNETIC FIELD. 



BY _^_^ 



F. E. HACKETT, M.A., Ph.D., [ AUG r 6 , 



4- ° '9/9 ' 



LECTURER IN PHYSICS, KOYAL COLLEGE OF SCIENCE, DUBLIN. \_ 'fifl-i M " *_j 



[A uihors alone are responsible for all opinions expressed in their Communications. 1 



DUBLIN : 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 



LEINSTER HOUSE, DUBLIN. 



WILLIAMS AND NORGATE, 



H HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. 



1918. 



Price Sixpence. 



