WATER NUCLEI. 



79 



Table 27. Enlargement of nuclei of dust-free air. Glass fog chamber, single wet 

 cloth partition. dp = ^o.g cm.; s found after complete subsidence of preceding corona ; 

 s' after partial subsidence with evaporation. 



1 After many days' waiting. 



wog, 



3 After few minutes' waiting. 



'gBP. 



* Blurred with much rain. 



140 



120 



100 



Figs. 37 and 38. Periodic variation of efficient nucleation (n) in case of an 

 open filter cock. Tables 27 and 28. 



