1028 



These observations are put together in table 1; /; stands lor the 

 pressure in mms mercurj, S for the distance of the electrodes in cms. 



Our results lie witliin (he limits of those obtained by other 

 observers and differ but little from the values given in the 



TABLE 1 

 Sparking-potentials in dry, C02-free air. 



"Standardization rules of the A. I. E. E." ') for the sparking potentials 

 between spheres of a diameter of 62.5 mms (compare fig. 2). 



In figs 3 — 5 our observations on argon, nitrogen and mixtures of 

 argon and nitrogen are plotted. Table 2 contains the results of our 

 measurements. 



Fig. 2. 



1) Standardization rules, Edition of July, 1, 1915, p. 50. 



