﻿1875.] 
  

  

  Stress 
  on 
  Inductive 
  Magnetism 
  in 
  Soft 
  Iron. 
  

  

  475 
  

  

  shows 
  the 
  mean 
  effect 
  of 
  many 
  ons 
  and 
  offs 
  with 
  no 
  current 
  flowing 
  — 
  

   that 
  is 
  to 
  say, 
  when 
  the 
  sole 
  magnetizing 
  force 
  is 
  the 
  vertical 
  component 
  

  

  of 
  the 
  earth's 
  magnetic 
  force. 
  The 
  curves 
  are 
  drawn 
  as 
  smoothly 
  as 
  may 
  

   be 
  by 
  hand, 
  one 
  of 
  them 
  to 
  pass 
  as 
  nearly 
  as 
  it 
  can 
  (without 
  intolerable 
  

   roughness) 
  through 
  all 
  the 
  crossed 
  (plus) 
  dots 
  and 
  the 
  star 
  at 
  64, 
  the 
  

   other 
  through 
  all 
  the 
  plain 
  dots. 
  The 
  latter 
  curve 
  cuts 
  the 
  line 
  of 
  abscissas 
  

   at 
  8, 
  this 
  being 
  the 
  result 
  (telegraphed 
  to 
  me 
  this 
  evening) 
  of 
  special 
  

  

  