Detector for Electric Waves. 

 Taking away the cylinder, I found : — 



503 



Experiment. 



Initial 

 Resistance. 



Final 

 Resistance. 



Decrease 

 of Resistance. 



1. 

 2. 



2300 

 230-0 



227'6 

 228-0 



2-4 



20 



Experiment 10. 



In this experiment, my tinfoil grating No. 2 was placed 

 just in front of a metallic plate, that is to say, near the node 

 of the stationary electric waves produced by the plate, with 

 the following results : — 



Experiment. 



Initial 

 Resistance. 



Final 

 Resistance. 



Decrease 

 of Resistance. 



1. 



2. 



3. 



222-0 

 227 



228-0 



200-0 

 206-0 

 206-5 



220 

 21-0 

 21-5 



Taking away the plate, I found : — 



Experiment. 



Initial 

 Resistance. 



Final 

 Resistance. 



Decrease 

 of Resistance. 



1. 



2. 



227-2 

 225-7 



184-7 

 184-5 



42-5 

 41-2 



Experiment 11. 



In order to examine whether the orientation of the tinfoil 

 grating with respect to the primary oscillations has an influ- 

 ence or none on the change of its resistance, the following 

 observations were carried out : — 



