﻿Alternating- 
  Current 
  Spark 
  Potentials. 
  

  

  703 
  

  

  Diameter 
  of 
  

   spheres 
  

   \ 
  in 
  cm. 
  

  

  No. 
  of 
  

   Resistance- 
  

   Boxes. 
  

  

  Ratio. 
  

  

  Average 
  

   Ratio. 
  

  

  2 
  

  

  3-85 
  

   10 
  

   15 
  

  

  20 
  

  

  30 
  

  

  ! 
  

  

  3 
  

   G 
  

  

  7 
  

   9 
  

  

  3 
  

   5 
  

  

  7 
  

   9 
  

  

  4 
  

  

  6 
  

  

  8 
  

  

  10 
  

  

  3 
  

   4 
  

   6 
  

   8 
  

   9 
  

  

  3 
  

   6 
  

   7 
  

   8 
  

   2 
  

   3 
  

   5 
  

  

  ^ 
  i 
  

  

  1-442 
  

   1-439 
  

   1-438 
  

   1-439 
  

  

  1-440 
  

   1-443 
  

   1-441 
  

   1-437 
  

  

  1-430 
  

   1-432 
  

   1-430 
  

   1-431 
  

  

  1-432 
  

   1-430 
  

   1-429 
  

   1-429 
  

   1-429 
  

  

  1-432 
  

   1-4-28 
  

   1-430 
  

   1-431 
  

  

  1-432 
  

   1-429 
  

   1-428 
  

   1-433 
  

  

  1-44 
  

   1-44 
  

   1-43 
  

  

  1-43 
  

  

  1-43 
  

   1-43 
  

  

  In 
  the 
  following 
  section 
  are 
  given 
  the 
  tables 
  of 
  the 
  striking- 
  

   distances, 
  with 
  the 
  corresponding 
  voltages, 
  both 
  effective 
  and 
  

   maximum 
  : 
  — 
  

  

  Table 
  II. 
  — 
  Diameter 
  of 
  spheres 
  2 
  cm. 
  Ratio 
  1*44. 
  

   .Frequency 
  of 
  alternating 
  current 
  33. 
  Barometric 
  height 
  

   715 
  mm. 
  Temperature 
  20° 
  C. 
  

  

  Explosive 
  Distance 
  

  

  Effective 
  

  

  Maximum 
  

  

  in 
  em. 
  

  

  Volts. 
  

  

  Volts. 
  

  

  00850 
  

  

  2730 
  

  

  3931 
  

  

  0-1364 
  

  

  3884 
  

  

  5593 
  

  

  0-1767 
  

  

  4733 
  

  

  6816 
  

  

  0-2200 
  

  

  5680 
  

  

  8179 
  

  

  0-3163 
  

  

  7607 
  

  

  10954 
  

  

  0-3723 
  

  

  8764 
  

  

  12620 
  

  

  04936 
  

  

  11094 
  

  

  15975 
  

  

  0-5370 
  

  

  11876 
  

  

  17101 
  

  

  0-6724 
  

  

  14349 
  

  

  20663 
  

  

  0-8752 
  

  

  17802 
  

  

  25635 
  

  

  09533 
  

  

  19028 
  

  

  27400 
  

  

  10689 
  

  

  20830 
  

  

  29995 
  

  

  1-3536 
  

  

  24383 
  

  

  35112 
  

  

  1-5316 
  

  

  26332 
  

  

  37918 
  

  

  1-7473 
  

  

  28047 
  

  

  40388 
  

  

  2-2151 
  

  

  31207 
  

  

  44938 
  

  

  