Dr. S. Guggenheimer on the Spark-discharge. 313 



Distance of the spheres (roughly) = 1 mm. 

 Potential V in Volts. 





V. 



V. 



y. 



Without radiation 



Radiation in B 



4500 

 3500 

 3500 



(rough 

 7500 

 6000 

 6000 



5500 

 3500 

 3400 



y) = 21 



8000 

 5500 

 6100 



5500 

 3500 

 3200 



mm. 



8000 

 5800 

 5900 



A 



Distance of spheres 

 Without radiation 



Radiation in B 



A 





I am compelled to observe that the observations do not 

 always give such concordant results for the cases of the 

 radiation in B and A as shown in the above tables. If the 

 electrodes are not freshly polished, and if the radiation in B 

 is not strong enough (so that fewer ions are produced), then 

 the results obtained are of the type shown by the following 

 table : — 



Distance of the spheres = 2'l mm. 





V. 



V. 



8000 

 6800 

 6100 



V. 



Without radiation 



8500 

 7000 

 6000 



8500 



Radiation in B 



A 



7000 

 6000 



Here one sees the discharge with radiation in B taking 

 place at potentials lying between the potentials obtained for 

 discharges without introduction of ions or without direct 

 radiations, and the potentials measured in exposing the 

 sparking system to direct radiation. But the potentials 

 necessary to produce the discharge were always about 1000 

 to 1500 volts lower than those measured without employing 

 any means to destroy the retardation. 



3. It might be permissible to insert here a few words with 

 a view to a theoretical explanation of these results. There 

 are, in my opinion, mainly two points to be considered which. 



