﻿508 
  Dr. 
  W. 
  Mansergh 
  Varley 
  on 
  Magnetism 
  induced 
  

  

  Mean 
  value 
  for 
  L= 
  1T65 
  x 
  10 
  6 
  cms., 
  or 
  nearly 
  12 
  x 
  10° 
  ems. 
  

   Similar 
  determinations 
  gave 
  the 
  self-induction 
  of 
  the 
  three 
  

   140 
  turn 
  solenoids 
  in 
  series 
  as 
  0'45 
  X 
  10 
  B 
  cms., 
  the 
  coil 
  III. 
  

   being 
  used 
  as 
  the 
  standard 
  for 
  comparison. 
  

  

  One 
  other 
  example 
  will 
  serve 
  to 
  show 
  the 
  application 
  of 
  

   this 
  method 
  to 
  determining 
  a 
  rather 
  larger 
  self-induction. 
  

  

  Let 
  a 
  be 
  the 
  deflexion 
  when 
  the 
  three 
  645 
  turn 
  solenoids, 
  

   whose 
  self-induction 
  we 
  have 
  just 
  determined, 
  and 
  the 
  standard 
  

   coils 
  J. 
  and 
  II. 
  are 
  in 
  circuit, 
  and 
  /3 
  the 
  deflexion 
  when 
  the 
  

   standard 
  coils 
  are 
  replaced 
  by 
  the 
  unknown 
  self-induction 
  L. 
  

   Then 
  r 
  /a 
  \ 
  2 
  » 
  

  

  L= 
  {(i/ 
  -42xlO 
  G 
  -12xlO 
  G 
  | 
  cms. 
  

  

  Table 
  IV. 
  

  

  

  

  

  

  8m 
  for 
  the 
  bundles 
  of 
  iron 
  

  

  Self-induction, 
  

   cms. 
  

  

  Capacity, 
  

   cms. 
  

  

  u. 
  

  

  (T 
  H 
  - 
  

  

  

  

  

  

  

  

  

  

  

  

  A 
  

  

  7 
  

  

  B 
  

  

  C 
  

   16 
  

  

  D 
  

  

  0-55 
  X 
  10 
  u 
  

  

  2430 
  

  

  130700 
  

  

  23 
  

  

  105 
  

  

  23 
  

  

  0-55 
  „ 
  

  

  3810 
  

  

  104300 
  

  

  27 
  

  

  105 
  

  

  14-5 
  20 
  

  

  30 
  

  

  0-55 
  „ 
  

  

  4760 
  

  

  933C0 
  

  

  32 
  

  

  12-5 
  

  

  17 
  

  

  22 
  

  

  35 
  

  

  0-55 
  „ 
  

  

  6080 
  

  

  82600 
  

  

  37-5 
  

  

  14 
  5 
  

  

  19 
  

  

  25-5 
  

  

  39 
  

  

  0-55 
  ,, 
  

  

  8510 
  

  

  69800 
  

  

  44 
  

  

  16 
  

  

  21 
  

  

  28-5 
  

  

  44 
  

  

  1-32 
  „ 
  

  

  4760 
  

  

  60300 
  

  

  22-5 
  

  

  11 
  

  

  15 
  

  

  18-5 
  

  

  26 
  

  

  132 
  „ 
  

  

  7030 
  

  

  4960O 
  

  

  26 
  

  

  13 
  

  

  17 
  

  

  22 
  

  

  32 
  

  

  1-32 
  „ 
  

  

  8510 
  

  

  45000 
  

  

  29 
  

  

  145 
  

  

  19 
  

  

  255 
  

  

  355 
  

  

  132 
  „ 
  

  

  10090 
  

  

  41400 
  

  

  37-5 
  

  

  19 
  

  

  23-5 
  

  

  28 
  

  

  41 
  

  

  1-32 
  „ 
  

  

  13150 
  

  

  36200 
  

  

  43-5 
  

  

  21 
  

  

  26-5 
  

  

  34 
  

  

  48 
  

  

  16 
  „ 
  

  

  1480 
  

  

  31000 
  

  

  36 
  

  

  19 
  

  

  235 
  

  

  29-5 
  

  

  41 
  

  

  24 
  .., 
  

  

  1480 
  

  

  25300 
  

  

  36 
  

  

  20 
  

  

  24-5 
  

  

  31 
  

  

  42 
  

  

  24 
  ., 
  

  

  1480 
  

  

  25300 
  

  

  29 
  

  

  17-5 
  

  

  22 
  

  

  28-5 
  

  

  36 
  

  

  38 
  „ 
  

  

  1480 
  

  

  20100 
  

  

  17 
  

  

  135 
  

  

  17 
  

  

  21 
  

  

  25 
  

  

  46 
  „ 
  

  

  1480 
  

  

  18300 
  

  

  26 
  

  

  18 
  

  

  22 
  

  

  28-5 
  

  

  35 
  

  

  46 
  „ 
  

  

  2430 
  

  

  14300 
  

  

  34 
  

  

  23 
  

  

  28'5 
  

  

  34-5 
  

  

  44 
  

  

  24 
  „ 
  

  

  3060 
  

  

  17600 
  

  

  47 
  

  

  26-5 
  

  

  32 
  

  

  40 
  

  

  53 
  

  

  46 
  ., 
  

  

  3060 
  

  

  12700 
  

  

  37 
  

  

  28 
  

  

  34 
  

  

  40 
  

  

  47 
  

  

  96 
  „ 
  

  

  3060 
  

  

  8820 
  

  

  29 
  

  

  23-5 
  

  

  30 
  

  

  36 
  

  

  42 
  

  

  153 
  „ 
  

  

  3060 
  

  

  7000 
  

  

  22 
  

  

  21 
  

  

  25 
  

  

  29 
  

  

  33 
  

  

  46 
  ,. 
  

  

  4640 
  

  

  10300 
  

  

  44 
  

  

  30 
  

  

  38 
  

  

  46 
  

  

  55 
  

  

  96 
  „ 
  

  

  4640 
  

  

  7150 
  

  

  30 
  

  

  28 
  

  

  34-5 
  

  

  40 
  

  

  44 
  

  

  153 
  „ 
  

  

  4640 
  

  

  5540 
  

  

  27 
  

  

  265 
  

  

  32 
  

  

  37 
  

  

  40 
  

  

  263 
  „ 
  

  

  4640 
  

  

  4320 
  

  

  2L 
  

  

  23-5 
  

  

  27 
  

  

  31 
  

  

  33 
  

  

  96 
  „ 
  

  

  6220 
  

  

  6200 
  

  

  44 
  

  

  36 
  

  

  42 
  

  

  52 
  

  

  55 
  5 
  

  

  153 
  „ 
  

  

  6220 
  

  

  4900 
  

  

  35 
  

  

  32 
  

  

  38 
  

  

  44 
  

  

  47 
  

  

  263 
  „ 
  

  

  6220 
  

  

  3730 
  

  

  27 
  

  

  28 
  

  

  33 
  

  

  37 
  

  

  40 
  

  

  153 
  „ 
  

  

  8550 
  

  

  4200 
  

   

  

  44 
  

   18 
  

  

  42 
  

  

  26 
  

  

  47-5 
  

   27 
  

  

  55 
  

  

  27-5 
  

  

  56 
  

  

  27 
  

  

  Direct 
  Current. 
  

  

  0-40 
  amp. 
  

  

  0-58 
  „ 
  

  

  

  

  26 
  

  

  39 
  

  

  40 
  

  

  42 
  

  

  41 
  

  

  0-88 
  „ 
  

  

  

  

  38 
  

  

  50 
  

  

  52 
  

  

  54 
  

  

  52-5 
  

  

  1-32 
  „ 
  

  

  

  

  55 
  

  

  59 
  

  

  61 
  

  

  

  61-5. 
  

  

  