250 \V. G. Cady — Electric Arc oetween Metallic Electrodes. 



5. The effects of varying the capacity, self-inductance, and 

 current of the discharge circuit are described. 



6. By means of a tuned resonating circuit the presence and 

 relative intensities oi a large number of high harmonics were 

 investigated. 



7. Observations of damping were carried out with difficulty, 

 but they indicate that the oscillations are undamped. 



8. The quantity of matter volatilized at the cathode on the 

 arc phase per cycle was measured. 



9. When a capacity and self -inductance are connected in 

 parallel with the discharge, the oscillations are diminished. 



10. Experiments are described that illustrate the radiation 

 of electromagnetic waves from the discharge and from the por- 

 tions of the circuit adjacent to it. 



Erratum. — In the second paper, page 97, line 32, for 

 " 0-3 amp." read " 3 amp." 



Scott Laboratory of Physics, 



Wesleyan University, June 11, 1909. 



