10 



Scientific Proceedings, Royal Dublin Society. 



4'3 x 10 5 grammes per sq. cm., when the A. C. magnetic field has a frequency 

 of 50, and for a frequency of 250 per second, the load which should be on the 

 wire to make the damping curves identical would be about 5*1 x 10 5 grammes 

 per sq. cm. 



*s 





Is 





Longitudinal Loads : grammes -per sq. cm. 

 Pig. 2. 



For the sake of comparison with the results given in Section I, and 

 in order to show the behaviour of iron wire when oscillating in a high 

 frequency alternating magnetic field, the whole of the observations obtained 

 are here given in Table XI. The load on the wire was V5 x 10 5 grammes 

 per sq. cm. The values are shown as curves in fig. 3. 



