﻿Directive 
  System 
  of 
  Wireless 
  telegraphy. 
  643 
  

  

  of 
  active 
  turns 
  equally 
  and 
  simultaneously 
  on 
  the 
  two 
  

   windings. 
  

  

  The 
  experiments 
  with 
  the 
  system 
  have 
  been 
  carried 
  out 
  at 
  

   three 
  stations 
  on 
  the 
  French 
  side 
  o£ 
  the 
  English 
  Channel, 
  at 
  

   Dieppe, 
  Havre, 
  and 
  Barfleur 
  respectively. 
  The 
  distance 
  

   Dieppe-Barfleur 
  is 
  107 
  miles, 
  all 
  over 
  sea 
  ; 
  that 
  between 
  

   Dieppe 
  and 
  Havre 
  54 
  miles, 
  entirely 
  over 
  land 
  ; 
  the 
  angle 
  

   made 
  by 
  the 
  three 
  stations 
  Havre-Dieppe-Barfleur 
  is 
  23°. 
  

  

  Employing 
  this 
  bilateral 
  system 
  it 
  has 
  been 
  possible 
  to 
  

   transmit 
  from 
  Dieppe 
  to 
  either 
  Havre 
  or 
  Barfleur 
  without 
  

   the 
  emission 
  which 
  was 
  directed 
  towards 
  the 
  one 
  post 
  

   troubling 
  the 
  other 
  one. 
  The 
  energy 
  sufficing 
  for 
  this 
  

   purpose 
  was 
  about 
  500 
  watts. 
  

  

  By 
  the 
  use 
  of 
  the 
  receiving 
  radiogoniometer 
  at 
  the 
  Dieppe 
  

   and 
  Havre 
  stations 
  the 
  authors 
  have 
  been 
  able 
  to 
  determine 
  

   the 
  direction 
  of 
  stations 
  both 
  known 
  and 
  unknown. 
  Further, 
  

   by 
  receiving 
  the 
  same 
  transmission 
  (signals) 
  simultaneously 
  

   at 
  both 
  Dieppe 
  and 
  Havre, 
  and 
  determining 
  at 
  each 
  station 
  

   the 
  bearing 
  of 
  the 
  unknown 
  station, 
  it 
  has 
  been 
  possible 
  to 
  

   locate, 
  by 
  intersection, 
  the 
  actual 
  position 
  of 
  the 
  station 
  

   which 
  was 
  transmitting. 
  The 
  accuracy 
  obtainable 
  by 
  the 
  

   use 
  of 
  the 
  receiving 
  radiogoniometer 
  is 
  about 
  one 
  degree 
  

   of 
  arc. 
  

  

  The 
  triangular 
  closed 
  oscillatory 
  circuits 
  comprising 
  the 
  

   aerial 
  system 
  were 
  45 
  metres 
  high, 
  with 
  a 
  base 
  of 
  55 
  metres. 
  

  

  Part 
  II. 
  

  

  The 
  system 
  of 
  wireless 
  telegraphy 
  reviewed 
  in 
  the 
  first 
  

   Part 
  allows 
  of 
  transmission 
  and 
  reception 
  in 
  the 
  plane 
  in 
  

   which 
  the 
  station 
  with 
  which 
  one 
  is 
  communicating 
  is 
  situated. 
  

   That 
  is 
  to 
  say, 
  in 
  transmitting, 
  one 
  is 
  sending 
  the 
  signals 
  to 
  

   the 
  corresponding 
  station 
  and 
  at 
  the 
  same 
  time 
  in 
  the 
  opposite 
  

   direction 
  also. 
  As 
  regards 
  the 
  reception, 
  either 
  of 
  two 
  dia- 
  

   metrically 
  opposite 
  transmitting 
  stations 
  will 
  affect 
  the 
  receiver 
  

   in 
  the 
  same 
  way, 
  and 
  it 
  will 
  not 
  be 
  possible 
  to 
  decide 
  as 
  to 
  

   which 
  side 
  of 
  the 
  receiving 
  station 
  the 
  transmitting 
  station 
  is 
  

   actually 
  located. 
  

  

  Since 
  the 
  sending 
  of 
  the 
  waves 
  in 
  a 
  single 
  useful 
  direction 
  

   is 
  often 
  of 
  great 
  importance, 
  and 
  it 
  is 
  desirable 
  to 
  be 
  able 
  to 
  

   decide 
  not 
  merely 
  the 
  direction 
  but 
  the 
  azimuth, 
  the 
  authors 
  

   have 
  worked 
  out 
  a 
  method 
  of 
  achieving 
  this 
  object, 
  and 
  have 
  

   solved 
  the 
  problem 
  in 
  the 
  following 
  manner. 
  

  

  Transmission. 
  — 
  The 
  diagram 
  of" 
  the 
  electromagnetic 
  field 
  

   2 
  U 
  2 
  

  

  

  