A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



127 



(s = 6-6.5), fi na ^y with still wider divergence to the upper g b p corona (s = 12). 

 The micleations corresponding to these double inflections are about as i, 2, 3 

 (w = 4,ooo to 5,000, 10,000, 300,000). The mean curve as far as the middle g b p 

 corona is to be separately constructed with the ordinates (nucleations n, while 

 the abscissas are apertures, s) enlarged 10 times. The lower periodicity must be 

 ignored from the crowded condition of coronas here; the upper periodicity 

 preferably presented as a discontinuity of the curve. 



The graph so obtained was used for all the reductions of the nucleation of 

 Chapter IX and elsewhere. From it table 14 was constructed. The nucleation 

 n may finally be reduced to air at normal pressure and temperature. 



TABLE 14. FOR THE REDUCTION OF NUCLEATIONS (n nuclei per cub. cm. of the 

 partially exhausted fog chamber). FROM APERTURES 5 AND 5. PRESSURE 

 DIFFERENCE, 17 cm. of Hg. 



5 chord in cm., when the goniometer arms are 19.5 cm. long. 

 5, " " " " " " " " 30 " " 



N OTE . The photographs of 15-21 were made from fog particles condensed (as stated) on persistent 

 nuclei. No attempt was made to photograph the fog particles condensed on ions or fleeting nuclei, because 

 the high exhaustions needed would have endangered the large condensation chamber. I shall therefore 

 return to the subject elsewhere with a modification of apparatus and w'th this specific point in view. 



