﻿H 
  

  

  510 
  Dr. 
  W. 
  Mansergh 
  Varley 
  on 
  Magnetism 
  Induced 
  

  

  of 
  the 
  magnetizing 
  force 
  are 
  calculated 
  from 
  the 
  ordinary 
  

   solenoid 
  formula 
  

  

  kirni 
  

   ~W' 
  

  

  Where 
  interpolation 
  has 
  been 
  necessary 
  the 
  figures 
  from 
  

   Table 
  IV. 
  are 
  given 
  in 
  small 
  type 
  for 
  comparison. 
  

  

  The 
  curves 
  I. 
  were 
  constructed 
  from 
  the 
  figures 
  of 
  this 
  

   table 
  to 
  show 
  graphically 
  the 
  relation 
  between 
  the 
  decrease 
  

   in 
  the 
  magnetization 
  with 
  the 
  increase 
  in 
  the 
  frequency 
  for 
  

  

  Fig. 
  2. 
  — 
  Curves 
  I. 
  

  

  TO 
  40 
  

  

  J2 
  35 
  

  

  ci 
  

  

  § 
  2S 
  

  

  O 
  20 
  

  

  t\ 
  ' 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  i 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  Jo 
  

  

  S 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  \\ 
  

  

  V 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  ^ 
  

  

  ^ 
  

  

  *^J 
  

  

  

  

  

  ^»£ 
  

  

  9 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  ■«"<? 
  

  

  

  H 
  " 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  —2°. 
  

  

  -*/ 
  

  

  fit 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  No. 
  of 
  oscillations 
  per 
  second, 
  

   the 
  bundle 
  B 
  of 
  iron 
  for 
  different 
  magnetizing 
  forces 
  (H 
  ) 
  ; 
  

   and 
  the 
  curves 
  II. 
  to 
  show 
  the 
  same 
  for 
  different 
  diameters 
  of 
  

   wire 
  with 
  the 
  same 
  magnetizing 
  force 
  (H 
  = 
  66 
  C.G.s. 
  units). 
  

  

  A 
  third 
  set 
  of 
  curves 
  (III.) 
  is 
  also 
  given, 
  which 
  show 
  the 
  

   relation 
  between 
  the 
  magnetization 
  and 
  the 
  magnetizing 
  force 
  

   for 
  another 
  specimen 
  of 
  iron 
  for 
  direct 
  currents 
  and 
  for 
  

   oscillatory 
  currents 
  of 
  frequencies 
  10,000 
  and 
  20,000 
  per 
  

   second. 
  

  

  For 
  the 
  most 
  frequent 
  oscillations 
  worked 
  with, 
  the 
  mag- 
  

   netization 
  was 
  found 
  to 
  be 
  proportional 
  to 
  the 
  surface 
  of 
  iron 
  

   in 
  the 
  case 
  of 
  the 
  bundles 
  A, 
  B, 
  and 
  C, 
  though 
  not 
  in 
  the 
  

   case 
  of 
  D, 
  as 
  may 
  be 
  seen 
  by 
  comparing 
  the 
  figures 
  for 
  the 
  

   highest 
  frequencies 
  given 
  in 
  Table 
  IV. 
  with 
  those 
  given 
  in 
  the 
  

   last 
  column 
  of 
  Table 
  I. 
  This 
  shows 
  that 
  with 
  the 
  most 
  rapid 
  

   oscillations 
  employed, 
  the 
  magnetizing 
  force 
  did 
  not 
  penetrate 
  

   to 
  the 
  centre 
  of 
  the 
  thickest 
  wires 
  used, 
  but 
  did 
  penetrate 
  to 
  

   the 
  middle 
  of 
  the 
  thinnest 
  wires. 
  

  

  