CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



The preceding data are shown in fig. 16, with a distinction between 

 the observed and computed values of s. The usual difficulties due to 

 impure colors are apparent. In view of the high exhaustions many 

 typical coronas do not appear and the small coronas are lost by the 

 efficiency of vapor nuclei as stated. 



4- 6 8 fO <f& J4 



"T 



600 



JOO 



400 



4 6 8 10 iZ 14- 16 18 ZO 22. /?4 



FIG. 1 6. Nucleation n, in terms of the apertures of coronas. High exhaustion. 



31. Standardization with ions. The endeavor to standardize the 

 coronas by precipitating the fog particles upon ions lead to peculiar 

 results, which makes it necessary to discuss the subject independently in 

 Chapter V. In fact, about one-half of the water nuclei w r hich should be 

 present after the first evaporation of fog particles vanishes independently. 

 Half the ions are thus not represented by fog particles, except in the 

 first precipitation. The remainder in the subsequent exhaustions behave 

 more normally. 



32. Further data. Results obtained in case of the intermediate 

 exhaustions 5p 3 = 17 cm. are liable to be most serviceable for the con- 

 struction of a practical table, and two further series were therefore 

 investigated under atmospheric conditions different from the above. 

 These results are given in table 20 and in figs. 17 and 18. In both series 

 the agreement between the observed and computed values of 5 within 

 5 = 10 is surprisingly close. The attempt was, moreover, to compute 

 tables 1 6 and 17 under modified suppositions, putting [Sp 2 ] = i6.T > as 

 in table 20 and then reducing all data to 24. The results are of no 

 marked advantage over the earlier data and are therefore omitted. 



