﻿376 
  Scientific 
  Intelligence, 
  

  

  integral 
  part 
  of 
  x 
  relates 
  merely 
  to 
  the 
  expansion 
  of 
  the 
  gas 
  by 
  

   temperature, 
  the 
  relation 
  between 
  the 
  viscosities 
  (/x) 
  and 
  tempera- 
  

   tures 
  (0) 
  is 
  given 
  by 
  the 
  formula 
  — 
  = 
  I 
  — 
  \ 
  , 
  whence 
  n 
  = 
  0*812 
  

  

  or, 
  as 
  finally 
  corrected, 
  0-822. 
  The 
  author 
  concludes 
  : 
  

  

  " 
  The 
  following 
  table 
  embodies 
  the 
  results 
  obtained 
  in 
  a 
  some- 
  

   what 
  extended 
  series 
  of 
  observations. 
  The 
  numbers 
  given 
  are 
  

   the 
  values 
  of 
  n, 
  corrected 
  for 
  the 
  expansion 
  of 
  the 
  glass. 
  

  

  Air 
  (dry) 
  0*754 
  

  

  Oxygen 
  0-782 
  

  

  Hydrogen.. 
  0*681 
  

  

  Argon 
  (impure) 
  0*801 
  

  

  Argon 
  (be^t) 
  . 
  _ 
  _ 
  0*815 
  

  

  In 
  the 
  last 
  trials, 
  the 
  argon 
  was 
  probably 
  within 
  1 
  or 
  2 
  per 
  

   cent 
  of 
  absolute 
  purity. 
  The 
  nitrogen 
  lines 
  could 
  no 
  longer 
  be 
  

   seen, 
  and 
  scarcely 
  any 
  further 
  contraction 
  could 
  be 
  effected 
  on 
  

   sparking 
  with 
  oxygen 
  or 
  hydrogen. 
  

  

  It 
  will 
  be 
  seen 
  that 
  the 
  temperature-change 
  of 
  viscosity 
  in 
  

   argon 
  does 
  not 
  differ 
  very 
  greatly 
  from 
  the 
  corresponding 
  change 
  

   in 
  air 
  and 
  oxygen. 
  At 
  any 
  rate 
  the 
  simpler 
  conditions 
  under 
  

   which 
  we 
  may 
  suppose 
  the 
  collisions 
  to 
  occur, 
  do 
  not 
  lead 
  to 
  

   values 
  of 
  n 
  such 
  as 
  0*5, 
  or 
  1*0, 
  discussed 
  by 
  theoretical 
  writers." 
  

   — 
  Proc. 
  Boy. 
  /Soc, 
  lxvi, 
  68. 
  

  

  2. 
  Behavior 
  of 
  Becquerel 
  and 
  Bontgen 
  rays 
  in 
  a 
  magnetic 
  

   field 
  ; 
  by 
  R. 
  J. 
  Strutt. 
  — 
  Referring 
  to 
  the 
  fact 
  that 
  it 
  has 
  been 
  

   proved 
  that 
  Becquerel 
  rays 
  are 
  deflected 
  in 
  a 
  magnetic 
  field, 
  the 
  

   author 
  remarks 
  that 
  this 
  result 
  is 
  of 
  great 
  interest 
  on 
  account 
  of 
  

   the 
  light 
  which 
  it 
  throws 
  on 
  the 
  nature 
  of 
  the 
  rays. 
  He 
  says 
  : 
  

  

  " 
  Up 
  to 
  the 
  present, 
  the 
  evidence 
  has 
  tended 
  to 
  show 
  that 
  the 
  

   Becquerel 
  rays 
  were 
  of 
  the 
  same 
  nature 
  as 
  the 
  Rontgen 
  rays, 
  

   both 
  being 
  capable 
  of 
  penetrating 
  thin 
  metal 
  sheets, 
  of 
  affecting 
  

   a 
  photographic 
  plate, 
  and 
  of 
  producing 
  ionization 
  in 
  the 
  surround- 
  

   ing 
  air. 
  Neither 
  could 
  be 
  refracted 
  or 
  reflected; 
  and 
  so 
  far 
  as 
  

   has 
  yet 
  appeared, 
  neither 
  could 
  be 
  polarized. 
  

  

  These 
  facts 
  seemed 
  to 
  form 
  a 
  fairly 
  strong 
  body 
  of 
  evidence 
  that 
  

   the 
  two 
  kinds 
  of 
  radiation 
  were 
  essentially 
  similar. 
  But 
  the 
  

   announcement 
  of 
  the 
  magnetic 
  deflectibility 
  of 
  the 
  Becquerel 
  rays 
  

   seems 
  to 
  throw 
  doubt 
  on 
  this 
  conclusion. 
  The 
  Rontgen 
  rays, 
  so 
  

   far 
  as 
  is 
  known, 
  are 
  quite 
  unaffected 
  by 
  magnetic 
  force. 
  Under 
  

   these 
  circumstances 
  it 
  seemed 
  worth 
  while 
  to 
  make 
  a 
  new 
  attempt 
  

   to 
  discover 
  such 
  an 
  effect 
  on 
  the 
  Rontgen 
  rays. 
  This 
  attempt 
  I 
  

   have 
  carried 
  out. 
  It 
  will 
  be 
  best 
  to 
  say 
  at 
  once 
  that 
  the 
  result 
  is 
  

   negative. 
  

  

  A 
  focus 
  tube 
  was 
  employed 
  as 
  the 
  source 
  of 
  radiation. 
  It 
  was 
  

   placed 
  at 
  a 
  distance 
  of 
  about 
  35 
  cm 
  from 
  a 
  powerful 
  electromagnet, 
  

   and 
  in 
  such 
  a 
  position 
  that 
  the 
  cathode 
  rays 
  in 
  the 
  tube 
  were 
  

   parallel 
  to 
  the 
  magnetic 
  force 
  due 
  to 
  the 
  magnet. 
  The 
  line 
  join- 
  

   ing 
  the 
  oblique 
  anti-cathode 
  to 
  the 
  center 
  of 
  the 
  magnetic 
  field 
  

   lay 
  in 
  the 
  plane 
  of 
  the 
  anti-cathode. 
  

  

  