﻿368 
  

  

  DESCRIPTION 
  OF 
  AN 
  ELECTRICAL 
  MACHINE 
  

  

  cited 
  under 
  circumstances 
  the 
  reverse 
  of 
  those 
  just 
  mentioned. 
  They 
  

   are 
  represented 
  as 
  simultaneous, 
  but, 
  with 
  the 
  same 
  machine, 
  can 
  of 
  

   course, 
  only 
  be 
  obtained 
  in 
  succession. 
  

  

  In 
  no 
  respect 
  do 
  the 
  phenomena 
  of 
  mechanical 
  electricity 
  appear 
  

   more 
  favourable 
  to 
  the 
  Franklinian 
  theory, 
  and 
  more 
  inexplicable, 
  

   according 
  to 
  the 
  doctrine 
  of 
  two 
  fluids, 
  than 
  in 
  the 
  diversity 
  of 
  the 
  

   electrical 
  spark 
  in 
  passing 
  between 
  a 
  small 
  and 
  a 
  large 
  metallic 
  ball, 
  

   according 
  to 
  the 
  manner 
  in 
  which 
  the 
  balls 
  are 
  associated 
  with 
  the 
  

   positive 
  or 
  negative 
  poles 
  of 
  the 
  machine. 
  When 
  the 
  small 
  ball 
  is 
  

   attached 
  to 
  the 
  positive 
  pole, 
  the 
  spark 
  is 
  long, 
  comparatively 
  narrow, 
  

   and 
  of 
  a 
  zigzag 
  shape, 
  such 
  as 
  lightning 
  is 
  often 
  seen 
  to 
  assume 
  : 
  but 
  

   when 
  the 
  situation 
  of 
  the 
  balls 
  is 
  reversed, 
  the 
  spark 
  is 
  straight 
  and 
  

   thick, 
  not 
  one-third 
  as 
  long, 
  and 
  nothing 
  of 
  a 
  zigzag 
  shape 
  can 
  be 
  ob- 
  

   served 
  in 
  it. 
  

  

  According 
  to 
  the 
  Franklinian 
  theory, 
  when 
  any 
  body 
  is 
  more 
  highly 
  

  

  