RESIDUAL WATER NUCLEI. 



I0 7 



therefore investigated in table 46, by aid of the method of two sources, 

 5 being their distance apart on a radius ^ = 250 cm., where S = 2R 

 tan 6/2, if 6 is the angular diameter of the coronas. The number of 

 water nuclei must be increased by the exhaustion, but not the initial 

 number of ions in the exhausted fog chamber. The data for n are 

 taken from the observed sizes of coronas as investigated above. 



TABLE 46. Fog chamber standardized with ions from radium. Bar. 76.0 cm.; temp. 

 20 C.; 60 seconds between observations ; subsidence 5 seconds. 



'Water nuclei removed by exhaustion, but the ions are not. 



