﻿II(/steresis 
  Loss 
  in 
  Iron 
  in 
  a 
  Rotating 
  Field. 
  

  

  8(5: 
  

  

  to 
  produce 
  a 
  field 
  10 
  per 
  cent, 
  greater 
  than 
  that 
  of 
  the 
  

   smaller 
  for 
  the 
  same 
  current, 
  but 
  with 
  25 
  amps 
  in 
  one 
  and 
  27*5 
  

   in 
  the 
  other, 
  the 
  maximum 
  values 
  of 
  the 
  two 
  fields 
  were 
  equal, 
  

  

  General 
  an'aDgement 
  of 
  the 
  magnetizing 
  coils 
  and 
  specimen. 
  

  

  each 
  being 
  about 
  250 
  C.G.S. 
  units, 
  and 
  the 
  two 
  together 
  pro- 
  

   ducing 
  a 
  uniform 
  rotating 
  field 
  of 
  this 
  magnitude. 
  At 
  a 
  

   distance 
  of 
  2 
  cms. 
  from 
  the 
  centre 
  of 
  the 
  coil 
  the 
  field 
  

   produced 
  was 
  1^ 
  per 
  cent. 
  less. 
  

  

  The 
  phase 
  relationship 
  of 
  the 
  currents 
  in 
  the 
  two 
  phases 
  

   was 
  indicated 
  by 
  means 
  of 
  a 
  \\ 
  attmeter, 
  the 
  thick 
  coil 
  oeing 
  

   in 
  one 
  circuit 
  and 
  the 
  thin 
  coil 
  connected 
  between 
  the 
  ends 
  

   of 
  a 
  non-inductive 
  resistance 
  in 
  the 
  circuit 
  of 
  the 
  other 
  

   phase. 
  A 
  phase-difference 
  of 
  90° 
  between 
  the 
  currents 
  in 
  

   the 
  two 
  circuits 
  was 
  shown 
  by 
  a 
  zero 
  reading 
  on 
  the 
  watt- 
  

   meter. 
  The 
  phase-difference 
  was 
  kept 
  within 
  "3 
  per 
  cent, 
  of 
  

  

  