﻿416 
  

  

  Susceptibility 
  of 
  Magnetic 
  Substances 
  

  

  with 
  the 
  magnetizing 
  force, 
  reaches 
  a 
  maximum, 
  and 
  de- 
  

   creases. 
  

  

  The 
  fifth 
  series 
  of 
  experiments 
  was 
  undertaken 
  in 
  the 
  

   hope 
  of 
  showing 
  definitely 
  whether 
  bismuth, 
  the 
  strongest 
  

   diamagnetic 
  substance 
  known, 
  does 
  or 
  does 
  not 
  vary 
  in 
  its 
  

   susceptibility 
  to 
  magnetization 
  as 
  the 
  magnetizing 
  force 
  is 
  

   made 
  to 
  vary. 
  

  

  Table 
  V., 
  which 
  gives 
  the 
  results 
  of 
  experiments 
  upon 
  

   bismuth 
  using 
  widely 
  different 
  fields, 
  is 
  arranged 
  in 
  a 
  way 
  

   similar 
  in 
  all 
  respects 
  to 
  the 
  preceding 
  tables. 
  

  

  Table 
  V. 
  — 
  Bismuth. 
  

  

  Pi 
  

  

  ■n- 
  h. 
  n\ 
  i! 
  203-0078 
  

   Bismuth 
  (1) 
  | 
  ; 
  203 
  . 
  0090 
  

  

  Bismuth 
  

  

  (2) 
  { 
  

  

  Bismuth 
  (3) 
  

  

  Bismuth 
  (4) 
  \ 
  

  

  r 
  

   Bismuth 
  (5) 
  j 
  

  

  202-8664 
  

   2028810 
  

  

  2025290 
  

   2025970 
  

  

  202-0909 
  

   2021010 
  

  

  Mean 
  

   Pv 
  

  

  Po- 
  

  

  Po 
  

  

  p= 
  

  

  2030084 
  | 
  2030114 
  -0330 
  

   202-8737 
  ! 
  203-0400 
  -1663 
  

  

  2025630 
  

  

  203-3932 
  ' 
  -8302 
  

  

  201-6156 
  

   201-7310 
  

  

  2020959 
  2030400 
  -9441 
  

  

  201-6733 
  2030400 
  \ 
  1367 
  

  

  w. 
  

  

  t. 
  

  

  4-58 
  

  

  •430 
  

  

  >! 
  

  

  )> 
  

  

  " 
  

  

  a 
  

  

  >) 
  

  

  j> 
  

  

  ; 
  " 
  

  

  )j 
  

  

  X10 
  S 
  

  

  12-55 
  

  

  -12-25 
  

  

  12-25 
  

  

  — 
  12 
  55 
  

  

  -1245 
  

  

  

  

  

  F= 
  

  

  

  

  Pi'- 
  

  

  Pa'- 
  

  

  lh'—Po'+S. 
  

  

  H. 
  

  

  (1) 
  

  

  72-9950 
  

  

  72-6986 
  

  

  •2981 
  

  

  1,620 
  

  

  (2) 
  

  

  73-3670 
  

  

  72-6914 
  

  

  •6764 
  

  

  3,680 
  

  

  (3) 
  

  

  746347 
  

  

  730140 
  

  

  1623 
  

  

  8,210 
  

  

  (4) 
  

  

  742720 
  

  

  72-6514 
  

  

  1622 
  

  

  8,800 
  

  

  (5) 
  

  

  74-5500 
  

  

  72-6270 
  

  

  1-925 
  

  

  10,450 
  

  

  Note. 
  —The 
  current 
  used 
  in 
  making 
  the 
  field 
  determinations 
  was 
  in 
  all 
  cases, 
  

   except 
  the 
  third, 
  "398 
  ampere 
  ; 
  in 
  the 
  third 
  case 
  it 
  was 
  "427 
  ampere. 
  £ 
  = 
  4'54. 
  

   $ 
  was 
  approximately 
  equal 
  in 
  all 
  cases 
  to 
  - 
  0020. 
  e 
  was 
  negligible. 
  

  

  As 
  the 
  table 
  shows, 
  the 
  fields 
  used 
  in 
  the 
  last 
  series 
  of 
  experi- 
  

   ments 
  vary 
  between 
  the 
  limits 
  of 
  1,620 
  and 
  10,450 
  lines 
  per 
  

   square 
  centimetre. 
  The 
  results 
  show 
  that 
  within 
  these 
  wide 
  

   limits 
  k 
  is 
  constant 
  for 
  bismuth. 
  

  

  A 
  similar 
  series 
  of 
  experiments 
  upon 
  white 
  wax 
  indicated 
  

   that 
  tc 
  for 
  this 
  substance 
  is 
  constant 
  within 
  wide 
  limits 
  of 
  the 
  

   field-strengths 
  ; 
  and 
  in 
  the 
  light 
  of 
  these 
  results 
  it 
  would 
  

   seem 
  probable 
  that 
  for 
  solids, 
  at 
  any 
  rate, 
  re 
  is 
  constant. 
  

  

  The 
  method 
  for 
  the 
  study 
  of 
  magnetic 
  and 
  diamagnetic 
  

  

  