﻿16 
  G.V. 
  M 
  adeem 
  — 
  Velocity 
  of 
  Electric 
  Waves 
  in 
  Air. 
  

  

  oscillator 
  were 
  in 
  tune. 
  This 
  experiment 
  confirms 
  the 
  truth 
  

   of 
  the 
  damping 
  theory 
  of 
  Poincare 
  and 
  Bjerknes. 
  

  

  Sarasin 
  and 
  de 
  la 
  Rive's 
  theory 
  of 
  a 
  multiplicity 
  of 
  waves 
  

   of 
  different 
  amplitudes 
  originating 
  at 
  the 
  same 
  oscillator 
  was 
  

   substantiated 
  by 
  the 
  erratic 
  readings 
  obtained 
  when 
  the 
  coherer 
  

   proper 
  alone 
  was 
  employed. 
  In 
  fact 
  the 
  truth 
  of 
  their 
  theory 
  

   was 
  readily 
  seen 
  when 
  the 
  ordinary 
  metal 
  filings 
  coherer 
  or 
  

   Branly 
  tube 
  was 
  used, 
  since 
  the 
  irregularity 
  of 
  the 
  readings 
  

   was 
  evidently 
  such 
  as 
  would 
  be 
  produced 
  by 
  quickly 
  succeed- 
  

   ing 
  waves 
  of 
  different 
  kinds 
  acting 
  upon 
  the 
  tube. 
  The 
  point 
  

   which 
  might 
  be 
  the 
  position 
  of 
  a 
  node 
  due 
  to 
  one 
  wave 
  would 
  

   be 
  the 
  anti-node 
  or 
  at 
  least 
  not 
  always 
  the 
  node 
  due 
  to 
  the 
  

   next 
  following 
  wave. 
  

  

  I 
  desire 
  here 
  to 
  express 
  my 
  gratitude 
  to 
  Professor 
  Trow- 
  

   bridge 
  for 
  his 
  valuable 
  suggestions, 
  his 
  assistance 
  and 
  his 
  very 
  

   great 
  kindness 
  in 
  placing 
  at 
  my 
  disposal 
  the 
  resources 
  of 
  the 
  

   Physical 
  Laboratory 
  in 
  order 
  to 
  have 
  this 
  experiment 
  carried 
  

   to 
  a 
  successful 
  completion. 
  

  

  Jefferson 
  Physical 
  Laboratory, 
  Harvard 
  Uoiversity, 
  

   Cambridge, 
  Mass., 
  April, 
  1899. 
  

  

  