﻿652 
  Mr. 
  J. 
  Patterson 
  on 
  the 
  Change 
  of 
  the 
  Electrical 
  

  

  were 
  pure, 
  and 
  the 
  wires 
  were 
  double 
  white-silk 
  covered, 
  

   0-0025 
  inch 
  diameter. 
  The 
  tin 
  was 
  practically 
  pure 
  ; 
  the 
  zinc 
  

   contained 
  about 
  il 
  per 
  cent, 
  lead 
  and 
  a 
  trace 
  of 
  iron 
  ; 
  the 
  

   cadmium 
  was 
  about 
  99^ 
  per 
  cent, 
  pure 
  and 
  had 
  a 
  little 
  zinc 
  

   and 
  a 
  trace 
  o£ 
  iron. 
  The 
  zinc 
  and 
  cadmium 
  were 
  tested 
  

   spectroscopically 
  for 
  bismuth, 
  but 
  no 
  trace 
  could 
  be 
  detected. 
  

   The 
  wires 
  were 
  in 
  the 
  latter 
  set 
  0'004 
  inch 
  diameter, 
  and 
  

   double 
  white-silk 
  covered. 
  The 
  carbon 
  was 
  obtained 
  by 
  

   carefully 
  removing 
  the 
  filament 
  from 
  an 
  8-volt 
  incandescent 
  

   lamp 
  so 
  that 
  the 
  connexions 
  were 
  not 
  broken. 
  It 
  was 
  then 
  

   mounted 
  on 
  mica 
  and 
  imbedded 
  in 
  paraffin. 
  A 
  large 
  number 
  

   of 
  observations 
  were 
  made 
  with 
  each 
  metal, 
  and 
  the 
  average 
  

   values 
  are 
  given 
  in 
  Table 
  V. 
  

  

  Table 
  V. 
  

  

  

  Cadmium. 
  

  

  Zinc. 
  

  

  Gold. 
  

  

  Platinum. 
  

  

  Tin. 
  

  

  Silver. 
  

  

  Carbon. 
  

  

  Magnetic 
  

   field. 
  

  

  <^10*. 
  

  

  ^10'. 
  

  

  5? 
  10*. 
  

  

  2?w. 
  

  

  5? 
  10*. 
  

  

  §-'l0«. 
  

  

  <^10 
  4 
  . 
  

  

  

  a 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  a 
  

  

  (7 
  

  

  a 
  

  

  29200 
  

  

  2116 
  

  

  6-35 
  

  

  3-02 
  

  

  •44 
  

  

  1-87 
  

  

  202 
  

  

  

  28600 
  

  

  20-86 
  

  

  5-98 
  

  

  2-93 
  

  

  •44 
  

  

  1-84 
  

  

  1-76 
  

  

  | 
  

  

  26200 
  

  

  

  5-72 
  

  

  . 
  .. 
  

  

  

  

  1-86 
  

  

  

  25500 
  

  

  18-0 
  

  

  5-3 
  i 
  

  

  

  

  1-52 
  

  

  

  

  25300 
  

  

  1736 
  

  

  509 
  

  

  2 
  : 
  39 
  

  

  •33 
  

  

  1-47 
  

  

  1-46 
  

  

  i 
  

  

  24400 
  

  

  

  

  

  

  

  

  2-73 
  

  

  21400 
  

  

  13-25 
  

  

  4 
  : 
  ii 
  

  

  

  

  1-24 
  

  

  1-54 
  

  

  

  21100 
  

  

  

  

  

  

  

  

  2-42 
  

  

  20400 
  

  

  12-32 
  

  

  3-77 
  

  

  

  

  109 
  

  

  1-22 
  

  

  

  19800 
  

  

  

  

  

  

  

  

  1-49 
  

  

  18400 
  

  

  10-51 
  

  

  3-47 
  

  

  

  

  

  •96 
  

  

  

  17900 
  

  

  

  

  

  

  

  

  1-18 
  

  

  17300 
  

  

  9-28 
  

  

  3-4*0 
  

  

  1 
  : 
  18 
  

  

  •27 
  

  

  ■74 
  

  

  •68 
  

  

  

  The 
  average 
  values 
  of 
  — 
  -qy 
  in 
  order 
  of 
  magnitude 
  

   obtained 
  from 
  above 
  tables 
  are 
  

  

  Cd 
  282. 
  

  

  Zn 
  87. 
  

  

  Hg 
  54. 
  

  

  C 
  44. 
  

  

  Au 
  37. 
  

  

  Ag 
  26. 
  

  

  Cu 
  26. 
  

  

  Sn 
  23. 
  

  

  Pt 
  6. 
  

  

  These 
  numbers 
  thus 
  represent 
  the 
  relative 
  values 
  of 
  — 
  for 
  

   the 
  same 
  magnetic 
  field. 
  

  

  To 
  measure 
  the 
  change 
  of 
  resistance 
  where 
  the 
  current 
  is 
  

   parallel 
  to 
  the 
  lines 
  of 
  force, 
  the 
  wire 
  was 
  wound 
  on 
  thin 
  

   strips 
  of 
  mica 
  15 
  mm. 
  long 
  and 
  3 
  or 
  4 
  mm. 
  wide. 
  These 
  

   strips 
  were 
  placed 
  one 
  on 
  top 
  of 
  the 
  other 
  so 
  as 
  to 
  form 
  a 
  

  

  