PLATE 7. 

 Gap Damping. 



a. — Al-Al in Air. 



A = 525. 

 Water cooled. 



c. — Al-Al in H. 



A = 525 meters. 

 Water cooled. 



«. — Al-Al Arc in Air. 



A = 525 meters. 

 I„ = 1.3 amperes. 



b. — Al-Al in Air. 



A = 525 meters. 

 Water cooled. 



d. — Cu-Al in H. 

 Shows rectification. 



Same as Figure 5, except 

 hydrogen instead of air 

 surrounded gap. 



