104 



Scientific Proceedings, Royal Dublin Society. 



Table III. 



Eapidity == 810 x 10 s grammes per sq. cm. 



From the values in Table III it would seem that the application of a 

 transverse alternating magnetic field of 200 units decreases the amplitude of 

 oscillation of the 70th vibration by less than 4 per cent, as compared with 

 10| per cent, when the wire was softer (Table I) — that is, for a difference of 

 about 12£ per cent, in the rigidity. From Tables I and III we see that for 

 the same difference in the rigidity the amplitude of the 70th vibration is 

 increased nearly 70 per cent, for a direct magnetic field and about 81 per cent, 

 for an alternating field of 200 units and frequency 50 per second. The 

 results with the wires in the soft and hard state are shown in the form of 

 curves in the figure (p. 105), when the two upper curves refer to the hard 

 wire and the two lower to the wire in the soft state. 



