﻿890 
  Prof. 
  McLennan 
  and 
  Mr. 
  Keys 
  on 
  the 
  Electrical 
  

   given 
  by 
  

  

  £ 
  = 
  32. 
  7T 
  

  

  V 
  2 
  

  

  cm. 
  a 
  sec. 
  per 
  volt 
  a 
  cm., 
  

  

  (2) 
  

  

  where 
  i 
  is 
  expressed 
  in 
  amperes, 
  V 
  is 
  in 
  volts, 
  and 
  d 
  in 
  cm. 
  

   If 
  c 
  be 
  the 
  capacity 
  in 
  e.s.u. 
  of 
  the 
  electrode 
  AB 
  together 
  

   with 
  the 
  leading 
  wires 
  quadrants, 
  and 
  attached 
  condensers 
  

   to 
  which 
  it 
  is 
  connected 
  ; 
  r 
  the 
  radius 
  of 
  the 
  opening 
  in 
  the 
  

   ebonite 
  plate 
  EF, 
  x 
  the 
  number 
  of 
  scale-divisions 
  which 
  

   correspond 
  to 
  a 
  potential 
  of 
  1 
  volt 
  applied 
  to 
  the 
  quadrants, 
  

   and 
  y 
  the 
  number 
  of 
  scale-divisions 
  per 
  min. 
  corresponding 
  

   to 
  the 
  current 
  between 
  the 
  two 
  electrodes 
  for 
  a 
  given 
  applied 
  

   field, 
  then 
  i 
  in 
  equation 
  (1) 
  is 
  given 
  by 
  

  

  

  

  c 
  y 
  

  

  i 
  

  

  and 
  therefore 
  

  

  k 
  = 
  

  

  9.10 
  n, 
  60 
  

  

  32. 
  TT.d 
  3 
  

  

  V 
  2 
  " 
  

  

  ' 
  irr 
  2 
  

   LO 
  11 
  , 
  

  

  

  — 
  

  

  8 
  dKy 
  

   135 
  V 
  2 
  . 
  r 
  2 
  

  

  . 
  c 
  

  

  . 
  x' 
  

  

  Since 
  with 
  the 
  

   follows 
  that 
  h 
  is 
  

  

  apparatus 
  

   given 
  by 
  

  

  used 
  

  

  

  

  * 
  = 
  

  

  21 
  <- 
  

  

  amperes, 
  

  

  yc 
  

  

  x 
  . 
  60 
  . 
  9 
  . 
  10 
  11 
  . 
  ir 
  . 
  r* 
  

  

  d 
  = 
  l 
  cm. 
  and 
  r 
  = 
  53 
  cm. 
  it 
  

  

  c 
  . 
  y 
  

   x 
  V 
  2 
  ' 
  

  

  For 
  a 
  selected 
  pressure 
  this 
  relation 
  shows 
  that 
  y 
  should 
  

   be 
  proportional 
  to 
  V 
  2 
  . 
  

  

  One 
  set 
  of 
  readings 
  from 
  a 
  number 
  taken 
  with 
  this 
  

   apparatus 
  is 
  given 
  in 
  Table 
  VI., 
  and 
  curves 
  drawn 
  from 
  

  

  Table 
  VI. 
  

  

  

  !No. 
  of 
  Scale-divisions 
  per 
  yo\t—x- 
  

  

  = 
  400. 
  

  

  

  Positive 
  field. 
  

  

  Negative 
  field. 
  

  

  Values 
  of 
  y. 
  

  

  V 
  

  

  (in 
  volts). 
  

  

  V 
  2 
  

   (in 
  volts). 
  

  

  Values 
  of 
  y. 
  

  

  V 
  

  

  (in 
  volts). 
  

  

  V 
  2 
  

  

  (in 
  volts). 
  

  

  2-3 
  

  

  83-1 
  

  

  6,905-6 
  

  

  3-9 
  

  

  80-0 
  

  

  6,400-0 
  

  

  107 
  

  

  1G2-0 
  ' 
  

  

  ' 
  26,2440 
  

  

  11-3 
  

  

  1600 
  

  

  25,6000 
  

  

  255 
  

  

  242 
  

  

  58,564-0 
  

  

  35-2 
  

  

  243-0 
  

  

  59,0490 
  

  

  51-6 
  

  

  323-0 
  

  

  107,584-0 
  

  

  71-4 
  

  

  328-0 
  

  

  107,584-0 
  

  

  74-5 
  

  

  410-0 
  

  

  168,100-0 
  

  

  104-7 
  

  

  410-0 
  

  

  168,100-0 
  

  

  101-6 
  

  

  490 
  

  

  240,100 
  

  

  1300 
  

  

  490-0 
  

  

  240,100-0 
  

  

  147-3 
  

  

  5640 
  

  

  318,0960 
  

  

  164-3 
  

  

  565-0 
  

  

  319,2250 
  

  

  2028 
  

  

  6300 
  

  

  396,9000 
  

  

  220-6 
  

  

  6300 
  

  

  396,900-0 
  

  

  247-8 
  

  

  732-0 
  

  

  535,824-0 
  

  

  275-8 
  

  

  730-0 
  

  

  532,900 
  

  

  2928 
  

  

  882-0 
  

  

  777,9240 
  

  

  

  

  

  