Fig. 1. 

 High frequency circuit. 



* f> 



Condenser. 



1=^-- Spark gaps with air 

 *J) jets. 



30,000 volt secondary. 



75 volt primary. 



Card. 



.J) 







Fig. 2. 



High frequency loop, 

 with shunt puncturing card. 



Fig. 3. 



High frequency loop, 

 shunted by lamp. 



