A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



29 



TABLE 10. -ABSENCE OF APPRECIABLE RADIOACTIVITY. VERTICAL JET 

 NO. 9 IMPINGING ON WATER WITH VIOLENT CHURNING. 



1 Condenser at So volts in first row. Positive and negative charges follow charges of same sign during 

 passage of nuclei. 



As it is the purpose of the present section to find the nucleation and the 

 ionization of jets when shattering against a sohd obstacle is avoided, the ex- 

 periments were all made with jets either discharging vertically down into water 

 or with jets impinging upon each other either vertically or horizontally. 



The table shows that the insulation is, as a rule, better (smaller leakage) 

 after than before the passage of nuclei, for potentials of the same sign, so that no 

 induced radioactivity can be detected in comparison with the absolution and 

 release of charges by the apparatus. The absorption phenomenon is strongly 

 marked when the sign of the charge is changed, as in the two experiments after 

 nucleation. 



TABLE II.— IONIZATION AND NUCLEATION OF WATER NUCLEI. 



The ionization of the air from this turbulently discharging jet was now tested 

 as in table 1 1 . The coronas obtained did not go further than to correspond 



