THE 



SCIENTIFIC PROCEEDINGS 



OF 



THE ROYAL DUBLIN SOCIETY. 



i. 



THE SUBSIDENCE OF TOESIONAL OSCILLATIONS AND THE 

 FATIGUE OF IEON WIEES WHEN SUBJECTED TO THE 

 INFLUENCE OF ALTEENATING MAGNETIC FIELDS OF 

 FEEQUENCIES UP TO 250 PEE SECOND. 



By WILLIAM BEOWN, B.Sc., 

 Professor of Applied Physics, Boyal College of Science for Ireland, Dublin. 



[Read November 23, 1915. Published January 25, 1916.] 



Section I. 



In November of last year and in January of this year the present writer 

 brought before this Society the results of some experiments on the fatigue 

 and on the subsidence of torsional oscillations of iron wires when they were 

 subjected to the influence of alternating magnetic fields of frequency 

 50 per second. 1 



The present communication gives some results on fatigue and on torsional 

 subsidence, obtained with iron wires, when alternating magnetic fields of 

 frequencies up to 250 per second were employed. 



For a description of the apparatus used, and of the general methods of 

 experiment, reference should be made to the author's papers already 

 published. 2 



1 Scient. Proc. Boy. Dub. Soc, 1915, vol. xiv, No. 26, p. 336, No. 32, p. 393. 



2 Ibid., 1911, vol. xiii, No. 3, pp. 31 and 37, and 1915, vol. xiv, No. 26, p. 337. 



SCIENT. PROC, R.D.S,, VOL. XV., NO. I. A 



