NUCLEATION CONSTANTS OF CORONAS. 



55 



the nuclei of dust-free air, which are within reach of the exhaustion to 

 the extent of about n = 57,000. Coronas can not be brought to vanish, 

 but up to the final limit the water nuclei are alone active. The amount 

 of water precipitated per cubic centimeter at 25 was taken as m = 

 4.iXio~ 6 . Hence n' = 0.242 s 3 . The subsidence constants appear as 



$ = 7.4 5.8 4.9 

 S= 14.6 2.7 



7.2 



6-3 5-3 

 .1 3-6 



4.6 



7-3 5-6 5-0 



16.4 2.0 



an irregular series of values, due to the increasing efficiency of the vapor 

 nuclei of dust-free air. The values of 5 found in tables 16 and 17 are 

 therefore taken in preference. The observed drop [dp 2 ] corresponds to 

 ^ = 0.656. The diameter of particles is d = o.oiggn~ 113 . The value of 

 m taken will be replaced by a more recent value in section 34. 



TABLE 19. Coronas standardized. Phosphorus nuclei. Bar. 75.0 cm.; temp. 25; 

 60 seconds between observations; cock open 5 seconds. <>/>' = 27.1; ^3=20.5; 

 25.o; j/ = o.656; 8 = 6.5 assumed; = 0.0032. 



1 Nuclei of dust-free air and water nuclei remain constant. 



2 Nuclei of dust-free air in presence of water nuclei. 



