Alternating' Current Carbon Ar 



783 



Diagram 1 , 



Z Amps. 



4 Amps. 



^—^ 6 Amps. 



8 Amps. 

 OAmps. 



g 12 Amps. 

 l4Amps. 



Diagram 2. 



Mean D.C. 

 2Amps 

 L y Alternating 



(Ylean D.C 



Mean D.C. 

 Amps^ Alternating 



Cathode 



6 8 10 12 14 



The rate of carbon consumption per coulomb Comparison of Alternating- and Direct- 

 plotted against arc length. The shaded Current consumption, 

 area represents hissing arcs. 



