Refraction for Electric Waves. 



185 



with the value for 13. Alternate readings were taken, 

 averaged, and divided, giving, with distance readings for 

 headings of columns : — 





13 



8-3 





r 

 i 



i 



Deflexions «( 



I 



130 

 132 

 130 



12-8 

 12-8 

 125 



25-0 

 240 

 25-0 

 24-2 

 23-2 



Mean 



129 



24-28 





Eatio 1*88. 



All other points were likewise compared with the point 13. 



Ratios obtained in this way (expressed in per cents.) 

 giving the relative intensity of the resultant electric dis- 

 placement at the oscillator for different positions of the 

 reflecting wall, are here collected. The distance readings 

 are centimetres on a scale with arbitrary origin. To obtain 

 from these numbers the distance of the reflector from the 

 oscillator, it is necessary to subtract 7*5. 



Distance 



Relative 



Distance 



Relative 



Reading. 



Intensity. 



Reading. 



Intensity. 



8-2 



175 



123 



95 



8-3 



188 



12-5 



99 



8-4 



207 



12-8 



100 



8-5 



207 



130 



100* 



8-7 



196 



13-5 



90 



90 



157 



13-75 



75 



9-3 



114 



140 



73 



9o 



84 



14-25 



74 



97 



68 



14-5 



90 



9 85 



68 



14-7 



97 



100 



70 



15-0 



102 



103 



84 



15-5 



94 



105 



100 



15-75 



87 



1075 



104 



160 



76 



110 



106 



16-5 



72 



11-3 



103 



170 



82 



11-5 



94 



17 5 



92 



11-8 



83 



18-0 



84 



120 



84 





| 



* Assumed. 



Phil. Mag. S. 6. Vol 1. No. 2. Feb. 1901, 



