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  Messrs. 
  E. 
  Bellini 
  and 
  A. 
  Tosi 
  on 
  a 
  

  

  equal 
  and 
  composed 
  o£ 
  two 
  equal 
  tangent 
  curves 
  (fig. 
  A) 
  

   whose 
  equation 
  is 
  E 
  = 
  E 
  cos 
  2 
  a, 
  where 
  a 
  is 
  the 
  angle 
  which 
  

   the 
  direction 
  of 
  propagation 
  makes 
  with 
  the 
  plane 
  of 
  the 
  

   circuit. 
  The 
  diagram 
  of 
  the 
  electromagnetic 
  field 
  is 
  composed 
  

   of 
  two 
  equal 
  tangent 
  circles 
  (fig. 
  B). 
  

  

  Fig. 
  A. 
  

  

  Fi<r. 
  B. 
  

  

  Energy 
  Transmission 
  

   Diagram 
  (Micro- 
  

   watts). 
  

  

  Transmission 
  Diagram 
  

   of 
  Electromagnetic 
  

   Field 
  Intensity 
  

  

  (Microamperes). 
  

  

  It 
  is 
  owing 
  to 
  these 
  properties 
  possessed 
  by 
  closed 
  oscil- 
  

   latory 
  circuits 
  that 
  such 
  circuits 
  were 
  chosen 
  by 
  the 
  authors 
  

   for 
  use 
  as 
  directive 
  aerials 
  ; 
  and 
  the 
  triangular 
  form 
  of 
  

   circuit, 
  open 
  at 
  the 
  apex, 
  was 
  employed, 
  owing 
  to 
  the 
  fact 
  

   that 
  it 
  could 
  easily 
  be 
  sustained 
  by 
  a 
  single 
  mast. 
  In 
  order 
  

   to 
  be 
  able 
  to 
  transmit 
  and 
  receive 
  to 
  or 
  from 
  any 
  direction 
  

   whatsoever, 
  without 
  having 
  to 
  turn 
  the 
  aerial, 
  or 
  having 
  

   recourse 
  to 
  a 
  large 
  number 
  of 
  aerials 
  in 
  fixed 
  positions, 
  the 
  

   aerials 
  were 
  built 
  up 
  of 
  two 
  equal 
  closed 
  oscillatory 
  circuits, 
  

   vertically 
  placed 
  and 
  mutually 
  perpendicular. 
  This 
  aerial 
  

   svstem 
  is 
  connected 
  up 
  to 
  special 
  instruments 
  for 
  trans- 
  

   mission 
  and 
  reception 
  which 
  the 
  authors 
  have 
  called 
  "Radio- 
  

   goniometers." 
  

  

  The 
  radiogoniometer 
  for 
  transmission 
  comprises 
  two 
  fixed 
  

   windings, 
  m 
  1? 
  n 
  1? 
  mutually 
  perpendicular, 
  one 
  of 
  which 
  is 
  

   inserted 
  in 
  each 
  of 
  the 
  two 
  aerial 
  circuits 
  AB, 
  AjB^ 
  as 
  

   shown 
  diagrammatically 
  in 
  horizontal 
  projection 
  in 
  fig. 
  C. 
  

   A 
  third 
  winding 
  s, 
  enclosed 
  by 
  the 
  two 
  first, 
  is 
  arranged 
  so 
  

   as 
  to 
  be 
  movable 
  on 
  its 
  vertical 
  axis, 
  which 
  axis 
  is 
  that 
  of 
  

  

  