﻿On 
  Ionization 
  and 
  Wireless 
  Telegraphy, 
  567 
  

  

  to 
  the 
  existence 
  of 
  another 
  term 
  in 
  the 
  solution. 
  If 
  this 
  is 
  

   true, 
  the 
  real 
  expression 
  of 
  the 
  theory 
  shonld 
  not 
  be 
  equation 
  

   (6), 
  but 
  an 
  equation 
  in 
  which 
  N 
  equals 
  the 
  sum 
  of 
  two 
  terms. 
  

   The 
  first 
  term 
  would 
  be 
  the 
  right 
  member 
  o£ 
  equation 
  (6), 
  or 
  

   something 
  very 
  similar 
  to 
  it, 
  and 
  would 
  provide 
  the 
  first 
  

   maximum 
  and 
  account 
  for 
  the 
  "selective" 
  effect. 
  The 
  

   second 
  term 
  would 
  provide 
  the 
  second 
  maximum 
  and 
  account 
  

   for 
  the 
  " 
  normal 
  " 
  effect. 
  The 
  discovery 
  of 
  the 
  equation 
  of 
  

   the 
  relation 
  between 
  frequency 
  and 
  sensitiveness 
  would 
  be 
  

   of 
  practical 
  as 
  well 
  as 
  theoretical 
  importance, 
  since 
  it 
  would 
  

   render 
  possible 
  the 
  use 
  of 
  photoelectric 
  cells 
  as 
  the 
  most 
  

   sensitive 
  of 
  spectrophotometers. 
  We 
  have 
  not 
  succeeded 
  

   as 
  yet 
  in 
  discovering 
  such 
  a 
  solution 
  of 
  the 
  theoretical 
  

   equations. 
  

  

  We 
  are 
  glad 
  to 
  take 
  this 
  opportunity 
  to 
  express 
  our 
  

   thanks 
  to 
  Professor 
  Augustus 
  Trowbridge 
  for 
  many 
  valuable 
  

   suggestions 
  with 
  regard 
  to 
  the 
  adjustment 
  and 
  use 
  of 
  the 
  

   galvanometer. 
  

  

  Palmer 
  Physical 
  Laboratory, 
  

   Princeton, 
  N.J. 
  

  

  XL 
  VI. 
  The 
  Effect 
  of 
  Ionization 
  of 
  Air 
  on 
  Electrical 
  Oscillations 
  

   and 
  its 
  bearing 
  on 
  Long-Distance 
  Wireless 
  Telegraphy. 
  

   By 
  Edwin 
  H. 
  Barton, 
  B.Sc, 
  F.R.S.E., 
  Professor 
  of 
  

   Experimental 
  Physics, 
  and 
  Walter 
  B. 
  Kilby, 
  B.Sc. 
  y 
  

   " 
  1851 
  Exhibition 
  " 
  Research 
  Bursar, 
  University 
  College 
  , 
  

   Nottingham 
  *. 
  

  

  [Plate 
  XL] 
  

  

  IN 
  his 
  stimulating 
  address 
  before 
  the 
  physical 
  and 
  engi- 
  

   neering 
  sections 
  of 
  the 
  British 
  Association 
  at 
  Dundee 
  on 
  

   Sept. 
  6, 
  1912, 
  Dr. 
  Fleming 
  dealt 
  with 
  the 
  various 
  unsolved 
  

   problems 
  of 
  long-distance 
  wireless 
  telegraphy. 
  

  

  One 
  of 
  the 
  points 
  of 
  outstanding 
  difficulty 
  then 
  commented 
  

   upon 
  was 
  the 
  mechanism 
  of 
  the 
  propagation 
  of 
  the 
  aather 
  

   radiation 
  round 
  the 
  curvature 
  of 
  the 
  earth 
  in 
  those 
  cases 
  

   where 
  about 
  a 
  quarter 
  of 
  its 
  circumference 
  is 
  passed 
  over. 
  

  

  In 
  the 
  subsequent 
  discussion 
  Dr. 
  Eccles 
  brought 
  forward 
  

   his 
  theory 
  f, 
  which 
  attributes 
  the 
  bending 
  of 
  the 
  waves 
  

   round 
  the 
  earth 
  to 
  a 
  higher 
  velocity 
  of 
  propagation 
  in 
  the 
  

   upper 
  regions 
  of 
  the 
  atmosphere, 
  owing 
  to 
  the 
  ionization 
  

   there 
  present. 
  This 
  increased 
  speed 
  of 
  propagation 
  was 
  

  

  * 
  Communicated 
  by 
  the 
  Authors, 
  

   f 
  Proc. 
  Roy. 
  Soc. 
  A. 
  vol. 
  lxxxvii. 
  pp. 
  79-99 
  (1912). 
  

   2Q2 
  

  

  