﻿Rotation 
  of 
  Electric 
  Discharge. 
  

  

  539 
  

  

  pressure 
  (p), 
  «, 
  m, 
  and 
  V 
  (the 
  E.M.F. 
  of 
  the 
  induction- 
  

   coil) 
  in 
  air 
  in 
  the 
  first 
  instance. 
  It 
  should 
  be 
  noted 
  that 
  

   this 
  law 
  pertains 
  entirely 
  to 
  the 
  portion 
  AB 
  of 
  the 
  curves, 
  

  

  fig. 
  8. 
  

  

  Experiment 
  I. 
  — 
  Current 
  in 
  the 
  electromagnetic 
  circuit 
  

   constant 
  ( 
  = 
  2*2 
  amperes). 
  E.M.F. 
  of 
  the 
  induction- 
  

   coil 
  3E, 
  where 
  E 
  is 
  the 
  E.M.F. 
  due 
  to 
  one 
  cell 
  in 
  

   the 
  primary 
  circuit. 
  

  

  (in 
  millimetres 
  

   of 
  mercury). 
  

  

  16-5 
  

  

  T 
  

  

  (in 
  seconds). 
  

  

  1-97 
  

  

  P 
  

   T* 
  

  

  8-4 
  

  

  14-5 
  

  

  1-55 
  

  

  9-3 
  

  

  11-76 
  

  

  1-25 
  

  

  9-3 
  

  

  9-4 
  

  

  1 
  

  

  9-4 
  

  

  

  Mean 
  .... 
  

  

  .. 
  9-1 
  

  

  Experiment 
  II. 
  - 
  

  

  P- 
  

  

  18*85 
  

  

  — 
  C-=2*2 
  amperes. 
  

   T. 
  

   1-67 
  

  

  V 
  = 
  4E 
  

  

  P 
  

  

  T* 
  

  

  11-1 
  

  

  15 
  

  

  1-27 
  

  

  11-3 
  

  

  13-5 
  

  

  1-15 
  

  

  11-8 
  

  

  12 
  

  

  3-07 
  

  

  11-2 
  

  

  10-97 
  

  

  •98 
  

  

  11-1 
  

  

  

  Mean 
  

  

  11-4 
  

  

  Experiment 
  

  

  111.-0 
  = 
  2-2. 
  V 
  

  

  = 
  5E. 
  

  

  P> 
  

   23 
  

  

  T. 
  

   1-605 
  

  

  P 
  

   T* 
  

  

  14-37 
  

  

  19 
  

  

  1-26 
  

  

  15-8 
  

  

  15 
  

  

  •99 
  

  

  15-1 
  

  

  12 
  

  

  •72 
  

  

  16-6 
  

  

  10 
  

  

  •63 
  

  

  15*8 
  

  

  8 
  

  

  •515 
  

  

  15-5 
  

  

  

  Mean 
  

  

  15-5 
  

  

  