PLATE 6. 



Gap Damping Oscijllographs. 



a. 



Beats. 



c. — Al-Al in Air. 

 A = 525 meters. 

 lo = 1.2 amperes. 



e. — Al-Al in Air. 

 \ = 575 meters. 

 1„ = 1.5 amperes. 

 Water cooled. 



h.— Al-Al in H. 

 A -= 520 meters. 

 /o = 1.2 amperes. 



d. — Carbon-Carbon in Air. 

 A = 525 meters. 

 /q = 1.4 amperes. 



f.— Al-Al in H. 

 A = 575 meters, 

 /p = 1.9 amperes. 

 Water cooled. 



