Brown and Smith — Subsidence of Torsional Oscillations. 223 



equivalent direct field. 2. The damping due to a direct f eld is much greater 

 in a. soft nickel wire than in a hard one; whilst the damping due to an 

 alternating field is greater in a hard nickel wire than in a noft one. 



The same holds true when smaller or larger loads are on the wire ; thus, 

 with the load of 15 x 10* grammes per sq. cm., and a magnetic field of 

 20 c.g.s. units round the wire, we obtained the following numbers, which are 

 amplitudes of oscillations after seventy vibrations had taken place from the 

 initial amplitude of 300 divisions on the scale : — 



SOlENT. PROCi B.D.S., VOL. XIV. j NO. XlV. 



2l 



