

Detector for Electric Waves. 



491 



Experiment. 



Initial 

 Resistance. 



Final 

 Resistance. 



Decrease 

 of Resistance. 



1. 



2. 

 3. 



129-7 ohms. 

 129-7 „ 

 129-9 „ 



123-5 ohms. 

 123-4 „ 

 123-6 „ 



6*2 ohms. 

 6-3 „ 

 6'3 „ 



As Herr Aschkinass mentions, the resistance of the grating 

 once diminished by the action of electric waves could be 

 restored almost to its original value by tapping it. In this 

 experiment, resonance-sparks could be discovered behind the 

 board by means of my tinfoil resonator. 



Experiment 2. 



Next, a third strip was pasted on the board, half-way 

 between the other two, and the experiment repeated. The 

 results were: — 



Experiment. 



Initial 

 Resistance. 



Final 

 Resistance. 



Decrease 

 of Resistance. 



1. 



2. 

 3. 



129-7 

 129-8 

 1300 



123-7 

 123-8 

 123-5 



6-0 

 60 

 6-5 



Here the resonance-sparks behind the board were very 

 feeble. 



Experiment 3. 



Two more strips were then added bisecting the spaces 

 between those in the experiment 2. 



Experiment. 



Initial 

 Resistance. 



Final 

 Resistance. 



Decrease 

 of Resistance. 



1. 

 2. 

 3. 



1298 

 129-8 

 1301 



125-8 

 125-6 

 125-7 



40 



4-2 

 4.4 



The resonator behind the board gave no sparks in this case. 



