﻿608 
  Prof. 
  L. 
  Y. 
  King 
  on 
  the 
  Gradient 
  of 
  the 
  

  

  graphically 
  in 
  fig. 
  1. 
  The 
  intensity 
  at 
  the 
  earth's 
  surface 
  is 
  

   taken 
  to 
  be 
  unity. 
  

  

  

  

  

  

  

  Fig. 
  

  

  1. 
  

  

  

  

  

  

  

  metre:, 
  altitude 
  

  

  

  

  

  

  

  

  

  

  P.80 
  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  160 
  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  ftO 
  

  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  Refofce 
  

  

  ktmsity 
  

  

  

  

  •2 
  

  

  4 
  

  

  ■6 
  

  

  •8 
  

  

  10 
  

  

  /£-^. 
  

  

  W 
  

  

  f-6 
  

  

  /■8 
  

  

  P> 
  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  

  

  

  

  

  

  

  

  

  

  \ 
  

  

  16 
  

  

  cm 
  d<£l 
  

  

  h 
  

  

  

  

  

  

  

  

  

  \ 
  

  

  Sect. 
  3. 
  Discussion 
  of 
  Observations 
  on 
  the 
  Gradient 
  oj 
  

   the 
  Penetrating 
  Radiation. 
  

  

  An 
  excellent 
  summary 
  of 
  the 
  present 
  state 
  of 
  knowledge 
  

   on 
  the 
  subject 
  of 
  the 
  penetrating 
  radiation, 
  and 
  an 
  account 
  of 
  

   the 
  difficulties 
  attending 
  the 
  exact 
  measurement 
  of 
  its 
  in- 
  

   tensity, 
  has 
  recently 
  been 
  published 
  by 
  A.-B. 
  Chauveau 
  *. 
  

   An 
  account 
  of 
  attempts 
  to 
  measure 
  the 
  gradient 
  is 
  given 
  in 
  

   Sect. 
  18 
  of 
  the 
  paper 
  just 
  referred 
  to. 
  While 
  it 
  is 
  unnecessary 
  

   to 
  repeat 
  the 
  summary 
  of 
  the 
  paper 
  quoted, 
  it 
  will 
  suffice 
  to 
  

   state 
  that 
  observations 
  taken 
  from 
  the 
  top 
  of 
  high 
  buildings 
  

  

  * 
  Chauveau, 
  A.-B., 
  u 
  L'ionization 
  de 
  Fair 
  en 
  vase 
  clos 
  et 
  la 
  radiation 
  

   penetrante," 
  Part 
  I., 
  Le 
  Radium, 
  x. 
  Jan. 
  1913, 
  p. 
  17: 
  Part 
  II. 
  , 
  Le 
  

   Radium, 
  x. 
  Feb. 
  1913, 
  p. 
  69. 
  

  

  