508 M. B. W. Feddersen on the Electric Spark. 



InteiTcd of time between two partial discharges as influenced by 

 the resistance. — Coucerning the observations made with different 

 resistance-tubeSj I may state that there did not exist the necessary 

 concordance between those performed on different days. The 

 moist tubes, shortly after being filled, gave greater and more 

 variable values for the interval between two partial sparks, than 

 they did after some time. The reason for this I have in no way 

 been able to discover ; for before I was able to investigate it, I 

 was compelled to relinquish my experiments. From amongst 

 my numerous experiments, therefore, 1 select only those having 

 the constant distance of discharge of 7 millims., and (excepting 

 those marked with an asterisk) which were performed on the same 

 day with tubes which I had already frequently employed. The 

 observations, however, are only intended to show in general that 

 the intervals increase with the increasing resistances. A law for 

 this increase cannot be derived from my numbers, although it 

 would seem that the intervals of time increase more rapidly than 

 the resistances. In the following observations, the experiments 

 were so arranged that the conductor of the machine remained 

 always in contact with the inner coating of the Leyden jar. In 

 the experiments marked with an asterisk, it was connected with 

 two jars. 



