1029 



Fig. 3. 



Fig. 4. 



The ügures found for nitrogen lie in between the potentials determined 

 by Orgler ^) and the values found by Bouty for the "champ critique", 

 a quantity which is practically identical with the sparking-potential. ") 

 (See fig. 3). 



At lower pressures Jensen ') has also made some measurements. 

 Supposing his measurements were also made at 15°, his results are 

 lower than ours; but the temperature is not mentioned by him. 



Pure argon has been investigated by Bouty'') and at low pressures 



1) A. Ohglek, Ann. d Phys. 1900, 1, 159. 



3) E. Bouty, Journ. de Phys. 4. série III. 1904, 489, 593. 



3) J. G. Jensen, Phys. Rev. Vol. Vlll, 433, 1916. 



*) E. Bouty, Ann. de Clhim. et de Phys, 8. série. Tome 23 (1913 J p. 1. 



