528 



Scientific Proceedings, Royal Dublin Society, 



Three of the sets of observations from Table V are plotted as curves iu 

 Fig. 2, which show very clearly the great difference in the subsidence of 

 torsional oscillations in nickel wires in a D. 0. magnetic field, and in A. C. 



Number of Vibrations 

 Fig. 2. 



fields, and also the small cliange in tlie final amplitude in tlie A. C. field wlien 

 the frequency of the magnetic field is increased ./7«;e times. 



For assistance in making some of the observations I am indebted to 

 Mr. J. J. Murphy, a Fourtli-year Experimental Science Teacher, in training 

 in this Oollege. 



