Analytical Study of the Alternating Current Arc. 355 



Fig. 22. — Photometric Curves of Continuous Current Arc. 



Negative carbon 9 mm. uneored. 

 Positive carbon 15 mm. cored. 



-80-70-60-50 -^0 -30 -20 -20 700 d<?0 900 -|Q ,|(, ,3,0 t500 , 40 o 



