A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



13 



TABLE 10.— IONIZATION OF PHOSPHORUS NUCLEI.' dV/dt=2.5 LIT./MIN. 



TESTED AFTER 5-10 MIN. 



' Phosphorus nuclei conveyed in a damp current of air. Tested for coronas, the nucleated air of the 

 receiver shows the usual strength. 



13. Residual ionization after one hour. — The storage of phosphorus nuclei 

 over water in the above experiments did not exceed 10-15 minutes. It was 

 thought that by giving the fog particles more time to subside, the sign of the 

 residual ionization might become apparent, supposing that more negative 

 nuclei are precipitated. The results in table 11 are peculiar: whereas the 

 positive charges in the presence of the nucleation vanish more slowly than for 

 room air, the negative charge vanishes much faster. This would make an 



TABLE II. — RESIDUAL IONIZATION OF PHOSPHORUS NUCLEI AFTER ONE 

 HOUR. dV/dt = 2.s LIT./MIN. CHARGE AT ABOUT 20 VOLTS, OR LESS. 



