﻿G. 
  V. 
  Maclean 
  — 
  Velocity 
  of 
  Electric 
  Waves 
  in 
  Air. 
  11 
  

  

  Distances 
  in 
  ms. 
  

   from 
  me 
  reflector. 
  

  

  First 
  maxiraum 
  

   reading. 
  

  

  Increased 
  

   maximum 
  reading. 
  

  

  Tlie 
  increase 
  due 
  to 
  

   the 
  electric 
  waves. 
  

  

  4-1075 
  

  

  

  8-400 
  

  

  8-400 
  

  

  0-000 
  

  

  

  Second 
  zero 
  or 
  

   second 
  anti-node 
  

  

  

  8-750 
  

   8-400 
  

   8-500 
  

   7-600 
  

  

  8750 
  

   8-400 
  

   8.500 
  

   7-600 
  

  

  0-000 
  

   0-000 
  

   0-000 
  

   0-000 
  

  

  mean 
  (of 
  

  

  1 
  5 
  results) 
  

  

  0-0000 
  

  

  

  

  7-400 
  

  

  7-400 
  

  

  0-000 
  

  

  

  4-1876 
  

  

  

  

  

  0-0050 
  

  

  

  4-2876 
  

  

  

  

  

  0-0120 
  

  

  

  4-2880 
  

  

  

  

  

  0-0130 
  

  

  

  4-2940 
  

  

  

  

  

  0-0140 
  

  

  

  4-3350 
  

  

  

  

  

  00150 
  

  

  

  4-5056 
  

  

  

  

  

  0-0350 
  

  

  

  4-5600 
  

   4-6650 
  

   4-7250 
  

  

  only 
  

  

  The 
  readings 
  

   the 
  means 
  of 
  5 
  

  

  are 
  left 
  out, 
  

   results 
  are 
  given 
  

  

  0-0540 
  

   0-0740 
  

   0-0750 
  

  

  means 
  of 
  

  

  5 
  results 
  

  

  each 
  

  

  4-8640 
  

  

  

  

  

  0-1060 
  

  

  4-9150 
  

  

  

  

  

  0-1140 
  

  

  

  5-0000 
  

  

  

  

  

  0-1300 
  

  

  

  5-1700 
  

  

  

  

  

  0-1520 
  

  

  

  5-2830 
  

  

  

  

  

  0-1720 
  

  

  

  5-3285 
  

  

  

  

  

  0-1780 
  

  

  

  5-4500 
  

  

  

  

  

  0-1960 
  

  

  

  5-5863 
  

  

  

  8 
  000 
  

  

  8-233 
  

  

  0-233 
  

  

  

  

  

  7-900 
  

  

  8-160 
  

  

  260 
  

  

  mean 
  (of 
  

  

  Second 
  

  

  

  8-000 
  

  

  8-280 
  

  

  0-280 
  

  

  20 
  results) 
  

  

  node 
  

  

  

  8-000 
  

  

  8-285 
  

  

  0.285 
  

  

  0-2620 
  

  

  

  

  7-400 
  

  

  7.650 
  

  

  0.250 
  

  

  

  5-6215 
  

  

  

  

  

  0-2460 
  

  

  

  5-6925 
  

  

  

  

  

  0-2260 
  

  

  

  5-8150 
  

  

  

  

  

  0-1250 
  

  

  means 
  of 
  

  

  5 
  results 
  

  

  each 
  

  

  6-7000 
  

  

  

  The 
  readings 
  

  

  are 
  left 
  out, 
  

  

  0-0220 
  

  

  6 
  7135 
  

  

  only 
  

  

  the 
  means 
  of 
  5 
  results 
  are 
  given 
  

  

  0-0200 
  

  

  6-7140 
  

  

  

  

  

  0-0170 
  

  

  6-8850 
  

  

  

  

  

  0-0100 
  

  

  

  7-0330 
  

  

  

  

  

  0-0040 
  

  

  

  7-0650 
  

  

  

  7-300 
  

  

  7-300 
  

  

  0-000 
  

  

  

  

  

  7-400 
  

  

  7-400 
  

  

  0-000 
  

  

  mean 
  (of 
  

  

  25 
  results) 
  

  

  0-0000 
  

  

  Third 
  zero 
  or 
  

   third 
  anti-node 
  

  

  

  8-850 
  

   8-000 
  

   8-950 
  

  

  8 
  850 
  

   8000 
  

   8950 
  

  

  0000 
  

   0-000 
  

   0-000 
  

  

  

  

  7-000 
  

  

  7-000 
  

  

  0-000 
  

  

  

  7-0660 
  

  

  

  

  

  0-0010 
  

  

  

  71450 
  

  

  7-1775 
  

   7-2945 
  

  

  only 
  

  

  The 
  readings 
  are 
  left 
  out, 
  

   the 
  means 
  of 
  5 
  results 
  are 
  given 
  

  

  00060 
  

   0-0250 
  

   0-0450 
  

  

  means 
  of 
  

  

  5 
  results 
  

  

  each 
  

  

  7-5000 
  

  

  

  

  

  0-0800 
  

  

  

  The 
  means 
  of 
  each 
  of 
  these 
  sets 
  of 
  five 
  readings 
  are 
  taken 
  and 
  

   plotted 
  as 
  a 
  curve, 
  the 
  coordinates 
  of 
  whose 
  points 
  are 
  the 
  dis- 
  

   tances 
  of 
  the 
  coherer 
  from 
  the 
  reflector 
  and 
  these 
  mean 
  values. 
  

   The 
  resulting 
  curve 
  is 
  given 
  in 
  fig. 
  1. 
  

  

  